diff --git a/app/src/main/java/io/legado/app/constant/PreferKey.kt b/app/src/main/java/io/legado/app/constant/PreferKey.kt
index b869927e6..1e6600a61 100644
--- a/app/src/main/java/io/legado/app/constant/PreferKey.kt
+++ b/app/src/main/java/io/legado/app/constant/PreferKey.kt
@@ -20,4 +20,5 @@ object PreferKey {
     const val readBookFont = "readBookFont"
     const val fontFolder = "fontFolder"
     const val backupPath = "backupUri"
+    const val threadCount = "threadCount"
 }
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/help/PrefExtensions.kt b/app/src/main/java/io/legado/app/help/PrefExtensions.kt
index b9392ef7a..9a41707a1 100644
--- a/app/src/main/java/io/legado/app/help/PrefExtensions.kt
+++ b/app/src/main/java/io/legado/app/help/PrefExtensions.kt
@@ -1,12 +1,13 @@
 package io.legado.app.help
 
 import android.content.Context
+import io.legado.app.constant.PreferKey
 import io.legado.app.utils.getPrefBoolean
 import io.legado.app.utils.getPrefInt
 
 
 val Context.isShowRSS: Boolean
-    get() = getPrefBoolean("showRss", true)
+    get() = getPrefBoolean(PreferKey.showRss, true)
 
 val Context.threadCount: Int
-    get() = getPrefInt("threadCount", 16)
\ No newline at end of file
+    get() = getPrefInt(PreferKey.threadCount, 16)
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/ui/config/OtherConfigFragment.kt b/app/src/main/java/io/legado/app/ui/config/OtherConfigFragment.kt
index 4795b56bb..47e837ffe 100644
--- a/app/src/main/java/io/legado/app/ui/config/OtherConfigFragment.kt
+++ b/app/src/main/java/io/legado/app/ui/config/OtherConfigFragment.kt
@@ -17,6 +17,7 @@ import io.legado.app.help.threadCount
 import io.legado.app.lib.theme.ATH
 import io.legado.app.receiver.SharedReceiverActivity
 import io.legado.app.ui.filechooser.FileChooserDialog
+import io.legado.app.ui.widget.number.NumberPickerDialog
 import io.legado.app.utils.*
 
 
@@ -36,7 +37,7 @@ class OtherConfigFragment : PreferenceFragmentCompat(),
         putPrefBoolean("process_text", isProcessTextEnabled())
         addPreferencesFromResource(R.xml.pref_config_other)
         bindPreferenceSummaryToValue(findPreference(PreferKey.downloadPath))
-        bindPreferenceSummaryToValue(findPreference("threadCount"))
+        bindPreferenceSummaryToValue(findPreference(PreferKey.threadCount))
     }
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
@@ -56,6 +57,14 @@ class OtherConfigFragment : PreferenceFragmentCompat(),
 
     override fun onPreferenceTreeClick(preference: Preference?): Boolean {
         when (preference?.key) {
+            PreferKey.threadCount -> NumberPickerDialog(requireContext())
+                .setTitle(getString(R.string.threads_num_title))
+                .setMaxValue(999)
+                .setMinValue(1)
+                .setValue(requireContext().threadCount)
+                .show {
+                    requireContext().putPrefInt(PreferKey.threadCount, it)
+                }
             PreferKey.downloadPath -> FileChooserDialog.show(
                 childFragmentManager,
                 downloadPath,
@@ -92,7 +101,7 @@ class OtherConfigFragment : PreferenceFragmentCompat(),
                 // Set the summary to reflect the new value.
                 preference.setSummary(if (index >= 0) preference.entries[index] else null)
             }
-            preference?.key == "threadCount" -> preference.summary =
+            preference?.key == PreferKey.threadCount -> preference.summary =
                 getString(R.string.threads_num, stringValue)
             else -> preference?.summary = stringValue
         }
@@ -114,7 +123,7 @@ class OtherConfigFragment : PreferenceFragmentCompat(),
             PreferKey.downloadPath -> getPrefString(PreferKey.downloadPath)
                 ?: App.INSTANCE.getExternalFilesDir(null)?.absolutePath
                 ?: App.INSTANCE.cacheDir.absolutePath
-            "threadCount" -> requireContext().threadCount
+            PreferKey.threadCount -> requireContext().threadCount
             else -> getPrefString(key) ?: ""
         }
     }
diff --git a/app/src/main/java/io/legado/app/ui/widget/number/NumberPickerDialog.kt b/app/src/main/java/io/legado/app/ui/widget/number/NumberPickerDialog.kt
new file mode 100644
index 000000000..17fe9ab53
--- /dev/null
+++ b/app/src/main/java/io/legado/app/ui/widget/number/NumberPickerDialog.kt
@@ -0,0 +1,66 @@
+package io.legado.app.ui.widget.number
+
+import android.content.Context
+import android.widget.NumberPicker
+import androidx.appcompat.app.AlertDialog
+import io.legado.app.R
+import io.legado.app.utils.applyTint
+import io.legado.app.utils.hideSoftInput
+import kotlinx.android.synthetic.main.dialog_number_picker.*
+
+
+class NumberPickerDialog(context: Context) {
+    private val builder = AlertDialog.Builder(context)
+    private var numberPicker: NumberPicker? = null
+    private var maxValue: Int? = null
+    private var minValue: Int? = null
+    private var value: Int? = null
+
+    init {
+        builder.setView(R.layout.dialog_number_picker)
+    }
+
+    fun setTitle(title: String): NumberPickerDialog {
+        builder.setTitle(title)
+        return this
+    }
+
+    fun setMaxValue(value: Int): NumberPickerDialog {
+        maxValue = value
+        return this
+    }
+
+    fun setMinValue(value: Int): NumberPickerDialog {
+        minValue = value
+        return this
+    }
+
+    fun setValue(value: Int): NumberPickerDialog {
+        this.value = value
+        return this
+    }
+
+    fun show(callBack: ((value: Int) -> Unit)?) {
+        builder.setPositiveButton(R.string.ok) { _, _ ->
+            numberPicker?.let {
+                it.clearFocus()
+                it.hideSoftInput()
+                callBack?.invoke(it.value)
+            }
+        }
+        builder.setNegativeButton(R.string.cancel, null)
+        val dialog = builder.show().applyTint()
+        numberPicker = dialog.number_picker
+        numberPicker?.let { np ->
+            minValue?.let {
+                np.minValue = it
+            }
+            maxValue?.let {
+                np.maxValue = it
+            }
+            value?.let {
+                np.value = it
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/res/layout/dialog_number_picker.xml b/app/src/main/res/layout/dialog_number_picker.xml
new file mode 100644
index 000000000..ea6582170
--- /dev/null
+++ b/app/src/main/res/layout/dialog_number_picker.xml
@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="@color/background">
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:gravity="center"
+        tools:ignore="UselessParent">
+
+        <NumberPicker
+            android:id="@+id/number_picker"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content">
+
+        </NumberPicker>
+
+    </LinearLayout>
+
+</LinearLayout>
\ No newline at end of file