diff --git a/app/src/main/java/io/legado/app/ui/bookinfo/BookInfoActivity.kt b/app/src/main/java/io/legado/app/ui/bookinfo/BookInfoActivity.kt
index c72da24b6..b43433de7 100644
--- a/app/src/main/java/io/legado/app/ui/bookinfo/BookInfoActivity.kt
+++ b/app/src/main/java/io/legado/app/ui/bookinfo/BookInfoActivity.kt
@@ -120,7 +120,7 @@ class BookInfoActivity : VMBaseActivity<BookInfoViewModel>(R.layout.activity_boo
         tv_change_source.onClick {
             if (changeSourceDialog == null) {
                 viewModel.bookData.value?.let {
-                    changeSourceDialog = ChangeSourceDialog(it.name, it.author)
+                    changeSourceDialog = ChangeSourceDialog.newInstance(it.name, it.author)
                 }
             }
             changeSourceDialog?.show(supportFragmentManager, "changeSource")
diff --git a/app/src/main/java/io/legado/app/ui/changesource/ChangeSourceDialog.kt b/app/src/main/java/io/legado/app/ui/changesource/ChangeSourceDialog.kt
index f8bf69c21..b4d2f4589 100644
--- a/app/src/main/java/io/legado/app/ui/changesource/ChangeSourceDialog.kt
+++ b/app/src/main/java/io/legado/app/ui/changesource/ChangeSourceDialog.kt
@@ -1,6 +1,7 @@
 package io.legado.app.ui.changesource
 
 import android.os.Bundle
+import android.util.DisplayMetrics
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
@@ -8,17 +9,40 @@ import androidx.appcompat.widget.SearchView
 import androidx.fragment.app.DialogFragment
 import androidx.recyclerview.widget.LinearLayoutManager
 import io.legado.app.R
+import io.legado.app.utils.getViewModel
 import kotlinx.android.synthetic.main.dialog_change_source.*
 
 
-class ChangeSourceDialog(val name: String, val author: String) : DialogFragment() {
+class ChangeSourceDialog : DialogFragment() {
+
+    companion object {
+        fun newInstance(name: String, author: String): ChangeSourceDialog {
+            val changeSourceDialog = ChangeSourceDialog()
+            val bundle = Bundle()
+            bundle.putString("name", name)
+            bundle.putString("author", author)
+            changeSourceDialog.arguments = bundle
+            return changeSourceDialog
+        }
+    }
+
+    private lateinit var viewModel: ChangeSourceViewModel
 
     override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
+        viewModel = getViewModel(ChangeSourceViewModel::class.java)
         return inflater.inflate(R.layout.dialog_change_source, container)
     }
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
+        arguments?.let { bundle ->
+            bundle.getString("name")?.let {
+                viewModel.name = it
+            }
+            bundle.getString("author")?.let {
+                viewModel.author = it
+            }
+        }
         tool_bar.inflateMenu(R.menu.search_view)
         showTitle()
         initRecyclerView()
@@ -27,12 +51,14 @@ class ChangeSourceDialog(val name: String, val author: String) : DialogFragment(
 
     override fun onStart() {
         super.onStart()
-        dialog?.window?.setLayout(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)
+        val dm = DisplayMetrics()
+        activity?.windowManager?.defaultDisplay?.getMetrics(dm)
+        dialog?.window?.setLayout((dm.widthPixels * 0.9).toInt(), (dm.heightPixels * 0.9).toInt())
     }
 
     private fun showTitle() {
-        tool_bar.title = name
-        tool_bar.subtitle = getString(R.string.author_show, author)
+        tool_bar.title = viewModel.name
+        tool_bar.subtitle = getString(R.string.author_show, viewModel.author)
     }
 
     private fun initRecyclerView() {
diff --git a/app/src/main/java/io/legado/app/ui/changesource/ChangeSourceViewModel.kt b/app/src/main/java/io/legado/app/ui/changesource/ChangeSourceViewModel.kt
new file mode 100644
index 000000000..d5e36c5e3
--- /dev/null
+++ b/app/src/main/java/io/legado/app/ui/changesource/ChangeSourceViewModel.kt
@@ -0,0 +1,11 @@
+package io.legado.app.ui.changesource
+
+import android.app.Application
+import io.legado.app.base.BaseViewModel
+
+class ChangeSourceViewModel(application: Application) : BaseViewModel(application) {
+
+    var name: String = ""
+    var author: String = ""
+
+}
\ No newline at end of file