diff --git a/app/src/main/java/io/legado/app/constant/DbTable.kt b/app/src/main/java/io/legado/app/constant/DbTable.kt
new file mode 100644
index 000000000..11e8b2fb5
--- /dev/null
+++ b/app/src/main/java/io/legado/app/constant/DbTable.kt
@@ -0,0 +1,7 @@
+package io.legado.app.constant
+
+object DbTable {
+    const val books = "books"
+    const val book_sources = "book_sources"
+    const val replace_rules = "replace_rules"
+}
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/data/AppDatabase.kt b/app/src/main/java/io/legado/app/data/AppDatabase.kt
index 4e3be84f6..bd1ff6664 100644
--- a/app/src/main/java/io/legado/app/data/AppDatabase.kt
+++ b/app/src/main/java/io/legado/app/data/AppDatabase.kt
@@ -8,10 +8,10 @@ import androidx.room.migration.Migration
 import androidx.sqlite.db.SupportSQLiteDatabase
 import io.legado.app.data.dao.BookDao
 import io.legado.app.data.dao.ReplaceRuleDao
+import io.legado.app.data.dao.BookSourceDao
 import io.legado.app.data.entities.Book
 import io.legado.app.data.entities.Chapter
 import io.legado.app.data.entities.ReplaceRule
-import javax.xml.transform.Source
 
 
 @Database(entities = [Book::class, Chapter::class, ReplaceRule::class], version = 1, exportSchema = true)
@@ -51,5 +51,5 @@ abstract class AppDatabase : RoomDatabase() {
 
     abstract fun bookDao(): BookDao
     abstract fun replaceRuleDao(): ReplaceRuleDao
-
+    abstract fun sourceDao() : BookSourceDao
 }
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/data/dao/BookDao.kt b/app/src/main/java/io/legado/app/data/dao/BookDao.kt
index 0ea2baac1..a2cd9d7e7 100644
--- a/app/src/main/java/io/legado/app/data/dao/BookDao.kt
+++ b/app/src/main/java/io/legado/app/data/dao/BookDao.kt
@@ -6,25 +6,25 @@ import androidx.room.Dao
 import androidx.room.Insert
 import androidx.room.OnConflictStrategy
 import androidx.room.Query
+import io.legado.app.constant.DbTable
 import io.legado.app.data.entities.Book
 
-
 @Dao
 interface BookDao {
 
-    @Query("SELECT * FROM books WHERE `group` = :group")
+    @Query("SELECT * FROM ${DbTable.books} WHERE `group` = :group")
     fun observeByGroup(group: Int): DataSource.Factory<Int, Book>
 
-    @Query("SELECT descUrl FROM books WHERE `group` = :group")
+    @Query("SELECT descUrl FROM ${DbTable.books} WHERE `group` = :group")
     fun observeUrlsByGroup(group: Int): LiveData<List<String>>
 
-    @Query("SELECT * FROM books WHERE `name` in (:names)")
+    @Query("SELECT * FROM ${DbTable.books} WHERE `name` in (:names)")
     fun findByName(vararg names: String): List<Book>
 
-    @get:Query("SELECT descUrl FROM books")
+    @get:Query("SELECT descUrl FROM ${DbTable.books}")
     val allBookUrls: List<String>
 
-    @get:Query("SELECT COUNT(*) FROM books")
+    @get:Query("SELECT COUNT(*) FROM ${DbTable.books}")
     val allBookCount: Int
 
     @Insert(onConflict = OnConflictStrategy.REPLACE)
diff --git a/app/src/main/java/io/legado/app/data/dao/BookSourceDao.kt b/app/src/main/java/io/legado/app/data/dao/BookSourceDao.kt
new file mode 100644
index 000000000..36e2a53de
--- /dev/null
+++ b/app/src/main/java/io/legado/app/data/dao/BookSourceDao.kt
@@ -0,0 +1,14 @@
+package io.legado.app.data.dao
+
+import androidx.paging.DataSource
+import androidx.room.Dao
+import androidx.room.Query
+import io.legado.app.constant.DbTable
+import io.legado.app.data.entities.BookSource
+
+@Dao
+interface BookSourceDao {
+
+    @Query("select * from ${DbTable.book_sources} where ")
+    fun observeAll(): DataSource.Factory<Int, BookSource>
+}
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/data/dao/ReplaceRuleDao.kt b/app/src/main/java/io/legado/app/data/dao/ReplaceRuleDao.kt
index d4a2073c0..c09c9037e 100644
--- a/app/src/main/java/io/legado/app/data/dao/ReplaceRuleDao.kt
+++ b/app/src/main/java/io/legado/app/data/dao/ReplaceRuleDao.kt
@@ -3,13 +3,14 @@ package io.legado.app.data.dao
 import androidx.lifecycle.LiveData
 import androidx.paging.DataSource
 import androidx.room.*
+import io.legado.app.constant.DbTable
 import io.legado.app.data.entities.ReplaceRule
 
 
 @Dao
 interface ReplaceRuleDao {
 
-    @Query("SELECT * FROM replace_rules ORDER BY sortOrder ASC")
+    @Query("SELECT * FROM ${DbTable.replace_rules} ORDER BY sortOrder ASC")
     fun observeAll(): DataSource.Factory<Int, ReplaceRule>
 
     @Query("SELECT id FROM replace_rules ORDER BY sortOrder ASC")
diff --git a/app/src/main/java/io/legado/app/data/entities/Book.kt b/app/src/main/java/io/legado/app/data/entities/Book.kt
index 78b3694e8..4f49cc7ef 100644
--- a/app/src/main/java/io/legado/app/data/entities/Book.kt
+++ b/app/src/main/java/io/legado/app/data/entities/Book.kt
@@ -3,10 +3,11 @@ package io.legado.app.data.entities
 import android.os.Parcelable
 import androidx.room.*
 import io.legado.app.constant.AppConst.NOT_AVAILABLE
+import io.legado.app.constant.DbTable
 import kotlinx.android.parcel.Parcelize
 
 @Parcelize
-@Entity(tableName = "books", indices = [(Index(value = ["descUrl"], unique = true))])
+@Entity(tableName = DbTable.books, indices = [(Index(value = ["descUrl"], unique = true))])
 data class Book(@PrimaryKey
                 var descUrl: String = "",                   // 详情页Url(本地书源存储完整文件路径)
                 var tocUrl: String = "",                    // 目录页Url (toc=table of Contents)
diff --git a/app/src/main/java/io/legado/app/data/entities/Source.kt b/app/src/main/java/io/legado/app/data/entities/BookSource.kt
similarity index 96%
rename from app/src/main/java/io/legado/app/data/entities/Source.kt
rename to app/src/main/java/io/legado/app/data/entities/BookSource.kt
index 5399384d7..4867d5dd9 100644
--- a/app/src/main/java/io/legado/app/data/entities/Source.kt
+++ b/app/src/main/java/io/legado/app/data/entities/BookSource.kt
@@ -3,16 +3,17 @@ package io.legado.app.data.entities
 import android.os.Parcelable
 import androidx.room.*
 import io.legado.app.constant.AppUtils.GSON_CONVERTER
+import io.legado.app.constant.DbTable
 import io.legado.app.data.entities.rule.*
 import kotlinx.android.parcel.IgnoredOnParcel
 import kotlinx.android.parcel.Parcelize
 
 @Parcelize
 @Entity(
-    tableName = "sources",
+    tableName = DbTable.book_sources,
     indices = [(Index(value = ["sourceId"])), (Index(value = ["origin"], unique = false))]
 )
-data class Source (
+data class BookSource (
     @PrimaryKey(autoGenerate = true)
     @ColumnInfo(name = "sourceId")
     var id: Int = 0,                          // 编号
diff --git a/app/src/main/java/io/legado/app/data/entities/ExploreSearchUrl.kt b/app/src/main/java/io/legado/app/data/entities/ExploreSearchUrl.kt
index 2df63b4bb..97a4d2bfb 100644
--- a/app/src/main/java/io/legado/app/data/entities/ExploreSearchUrl.kt
+++ b/app/src/main/java/io/legado/app/data/entities/ExploreSearchUrl.kt
@@ -10,7 +10,7 @@ import kotlinx.android.parcel.Parcelize
 @Parcelize
 @Entity(tableName = "explore_search_urls",
     indices = [(Index(value = ["sourceId", "url"], unique = true))],
-    foreignKeys = [(ForeignKey(entity = Source::class,
+    foreignKeys = [(ForeignKey(entity = BookSource::class,
         parentColumns = ["sourceId"],
         childColumns = ["sourceId"],
         onDelete = ForeignKey.CASCADE))])       // 删除书源时自动删除章节
diff --git a/app/src/main/java/io/legado/app/data/entities/ReplaceRule.kt b/app/src/main/java/io/legado/app/data/entities/ReplaceRule.kt
index 8b5a0fda6..6152c3bfd 100644
--- a/app/src/main/java/io/legado/app/data/entities/ReplaceRule.kt
+++ b/app/src/main/java/io/legado/app/data/entities/ReplaceRule.kt
@@ -5,10 +5,11 @@ import androidx.room.ColumnInfo
 import androidx.room.Entity
 import androidx.room.Index
 import androidx.room.PrimaryKey
+import io.legado.app.constant.DbTable
 import kotlinx.android.parcel.Parcelize
 
 @Parcelize
-@Entity(tableName = "replace_rules",
+@Entity(tableName = DbTable.replace_rules,
     indices = [(Index(value = ["id"]))])
 data class ReplaceRule(
                 @PrimaryKey(autoGenerate = true)
diff --git a/app/src/main/java/io/legado/app/ui/main/booksource/BookSourceAdapter.kt b/app/src/main/java/io/legado/app/ui/main/booksource/BookSourceAdapter.kt
index ae5a9d506..f21f087e9 100644
--- a/app/src/main/java/io/legado/app/ui/main/booksource/BookSourceAdapter.kt
+++ b/app/src/main/java/io/legado/app/ui/main/booksource/BookSourceAdapter.kt
@@ -6,18 +6,18 @@ import android.view.ViewGroup
 import androidx.paging.PagedListAdapter
 import androidx.recyclerview.widget.DiffUtil
 import androidx.recyclerview.widget.RecyclerView
-import io.legado.app.data.entities.Source
+import io.legado.app.data.entities.BookSource
 
-class BookSourceAdapter(context : Context) : PagedListAdapter<Source, BookSourceAdapter.MyViewHolder>(DIFF_CALLBACK) {
+class BookSourceAdapter(context : Context) : PagedListAdapter<BookSource, BookSourceAdapter.MyViewHolder>(DIFF_CALLBACK) {
 
     companion object {
 
         @JvmField
-        val DIFF_CALLBACK = object : DiffUtil.ItemCallback<Source>() {
-            override fun areItemsTheSame(oldItem: Source, newItem: Source): Boolean =
+        val DIFF_CALLBACK = object : DiffUtil.ItemCallback<BookSource>() {
+            override fun areItemsTheSame(oldItem: BookSource, newItem: BookSource): Boolean =
                 oldItem.id == newItem.id
 
-            override fun areContentsTheSame(oldItem: Source, newItem: Source): Boolean =
+            override fun areContentsTheSame(oldItem: BookSource, newItem: BookSource): Boolean =
                 oldItem.id == newItem.id
                         && oldItem.name == newItem.name
                         && oldItem.group == newItem.group
diff --git a/app/src/main/java/io/legado/app/ui/main/booksource/BookSourceFragment.kt b/app/src/main/java/io/legado/app/ui/main/booksource/BookSourceFragment.kt
index 3729409af..da499604f 100644
--- a/app/src/main/java/io/legado/app/ui/main/booksource/BookSourceFragment.kt
+++ b/app/src/main/java/io/legado/app/ui/main/booksource/BookSourceFragment.kt
@@ -5,22 +5,26 @@ import android.view.Menu
 import android.view.MenuItem
 import android.view.View
 import androidx.lifecycle.LiveData
+import androidx.lifecycle.Observer
+import androidx.paging.LivePagedListBuilder
 import androidx.paging.PagedList
 import androidx.recyclerview.widget.LinearLayoutManager
+import io.legado.app.App
 import io.legado.app.R
 import io.legado.app.base.BaseFragment
-import io.legado.app.data.entities.Source
+import io.legado.app.data.entities.BookSource
 import kotlinx.android.synthetic.main.fragment_book_source.*
 import kotlinx.android.synthetic.main.view_titlebar.*
 
 class BookSourceFragment : BaseFragment(R.layout.fragment_book_source) {
 
-    private lateinit var adapter : BookSourceAdapter
-    private var sourceLiveDate : LiveData<PagedList<Source>>? = null
+    private lateinit var adapter: BookSourceAdapter
+    private var bookSourceLiveDate: LiveData<PagedList<BookSource>>? = null
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         setSupportToolbar(toolbar)
         initRecyclerView()
+        initDataObservers()
     }
 
     override fun onCompatCreateOptionsMenu(menu: Menu) {
@@ -41,6 +45,8 @@ class BookSourceFragment : BaseFragment(R.layout.fragment_book_source) {
     }
 
     private fun initDataObservers() {
-
+        bookSourceLiveDate?.removeObservers(viewLifecycleOwner)
+        bookSourceLiveDate = LivePagedListBuilder(App.db.sourceDao().observeAll(), 30).build()
+        bookSourceLiveDate?.observe(viewLifecycleOwner, Observer { adapter.submitList(it) })
     }
 }
\ No newline at end of file