diff --git a/app/build.gradle b/app/build.gradle
index 4891fcbfd..89c0b7d53 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -3,6 +3,10 @@ apply plugin: 'kotlin-android'
 apply plugin: 'kotlin-android-extensions'
 apply plugin: 'kotlin-kapt'
 
+androidExtensions {
+    experimental = true
+}
+
 android {
     compileSdkVersion 28
     defaultConfig {
@@ -19,6 +23,19 @@ android {
             proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
         }
     }
+
+    compileOptions {
+        sourceCompatibility = '1.8'
+        targetCompatibility = '1.8'
+    }
+
+}
+
+
+kapt {
+    arguments {
+        arg("room.schemaLocation", "$projectDir/schemas")
+    }
 }
 
 dependencies {
diff --git a/app/src/main/java/io/legado/app/data/AppDatabase.kt b/app/src/main/java/io/legado/app/data/AppDatabase.kt
new file mode 100644
index 000000000..71cb9dbb1
--- /dev/null
+++ b/app/src/main/java/io/legado/app/data/AppDatabase.kt
@@ -0,0 +1,52 @@
+package io.legado.app.data
+
+import android.content.Context
+import androidx.room.Database
+import androidx.room.Room
+import androidx.room.RoomDatabase
+import androidx.room.migration.Migration
+import androidx.sqlite.db.SupportSQLiteDatabase
+import io.legado.app.data.dao.BookDao
+import io.legado.app.data.entities.Book
+
+
+@Database(entities = [Book::class], version = 1, exportSchema = true)
+// @TypeConverters(Converters::class)
+abstract class AppDatabase : RoomDatabase() {
+
+    companion object {
+        private const val DATABASE_NAME = "legado.db"
+
+
+
+        private val MIGRATION_1_2: Migration = object : Migration(1, 2) {
+            override fun migrate(database: SupportSQLiteDatabase) {
+                database.run {
+                    // execSQL("ALTER TABLE parsers ADD COLUMN fulltextScript TEXT")
+                    // execSQL("ALTER TABLE feeds ADD COLUMN lastUpdateTime INTEGER NOT NULL DEFAULT 0")
+                    // execSQL("DELETE FROM entries WHERE rowid NOT IN (SELECT MIN(rowid) FROM entries GROUP BY link)")
+                    // execSQL("CREATE UNIQUE INDEX index_entries_link ON entries(link)")
+                }
+            }
+        }
+
+        fun createDatabase(context: Context): AppDatabase {
+            return Room.databaseBuilder(context.applicationContext, AppDatabase::class.java, DATABASE_NAME)
+                // .addMigrations(MIGRATION_1_2)
+                // .addMigrations(MIGRATION_2_3)
+                // .addMigrations(MIGRATION_3_4)
+                // .addMigrations(MIGRATION_4_5)
+                // .addMigrations(MIGRATION_5_6)
+                .addCallback(object : Callback() {
+                    override fun onCreate(db: SupportSQLiteDatabase) {
+                        super.onCreate(db)
+                    }
+                })
+                .build()
+        }
+
+    }
+
+    abstract fun bookDao(): BookDao
+
+}
\ 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
new file mode 100644
index 000000000..b6ad0ba40
--- /dev/null
+++ b/app/src/main/java/io/legado/app/data/dao/BookDao.kt
@@ -0,0 +1,19 @@
+package io.legado.app.data.dao
+
+import androidx.lifecycle.LiveData
+import androidx.paging.DataSource
+import androidx.room.Dao
+import androidx.room.Query
+import io.legado.app.data.entities.Book
+
+
+@Dao
+interface BookDao {
+
+    @Query("SELECT * FROM books WHERE `group` = :group")
+    fun observeByGroup(group: Int): DataSource.Factory<Int, Book>
+
+    @Query("SELECT url FROM books WHERE `group` = :group")
+    fun observeUrlsByGroup(group: Int): LiveData<List<String>>
+
+}
\ No newline at end of file
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 8082605ab..800ea42d9 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
@@ -1,9 +1,9 @@
 package io.legado.app.data.entities
 
+import android.annotation.SuppressLint
 import android.os.Parcelable
 import androidx.room.*
 import kotlinx.android.parcel.Parcelize
-import java.util.*
 
 @Parcelize
 @Entity(tableName = "books",
@@ -18,9 +18,10 @@ data class Book(@PrimaryKey
                 var introduction: String? = null,
                 var charset: String? = null,
                 var type: Int = 0,   // 0: text, 1: audio
+                var group: Int = 0,  // fenqu
                 var latestChapterName: String? = null,
-                var lastUpdateTime: Date? = null,
-                var latestChapterTime: Date? = null,
+                var lastUpdateTime: Long? = null,
+                var latestChapterTime: Long? = null,
                 var durChapterIndex: Int = 0,
                 var durChapterPage: Int = 0,
                 var totalChapterNum: Int = 0,