diff --git a/app/src/main/java/com/casic/br/ar/app/view/PreviewPdfActivity.kt b/app/src/main/java/com/casic/br/ar/app/view/PreviewPdfActivity.kt
index 677aac7..ad3ffa3 100644
--- a/app/src/main/java/com/casic/br/ar/app/view/PreviewPdfActivity.kt
+++ b/app/src/main/java/com/casic/br/ar/app/view/PreviewPdfActivity.kt
@@ -22,13 +22,38 @@
     private val screenWidth by lazy { getScreenWidth() }
     private val screenHeight by lazy { getScreenHeight() }
 
+    //PDF默认缩放比例
+    private var scale = 1f
+
+    //PDF默认页
+    private var offset = 0
+
+    //最大页码
+    private var maxPages = 0
+
     override fun initEvent() {
         binding.topMoveButton.setOnClickListener {
-            binding.pdfView.moveRelativeTo(screenWidth / 2f, screenHeight / 6f)
+            binding.pdfView.moveRelativeTo(screenWidth / 2f, screenHeight / 5f)
+        }
+
+        binding.lastPageButton.setOnClickListener {
+            offset--
+            if (offset <= 0) {
+                offset = 0
+            }
+            binding.pdfView.jumpTo(offset, true)
+        }
+
+        binding.nextPageButton.setOnClickListener {
+            offset++
+            if (offset >= maxPages) {
+                offset = maxPages
+            }
+            binding.pdfView.jumpTo(offset, true)
         }
 
         binding.bottomMoveButton.setOnClickListener {
-            binding.pdfView.moveRelativeTo(screenWidth / 2f, -screenHeight / 6f)
+            binding.pdfView.moveRelativeTo(screenWidth / 2f, -screenHeight / 5f)
         }
     }
 
@@ -50,7 +75,9 @@
                 override fun onDownloadEnd(file: File) {
                     LoadingDialogHub.dismiss()
                     val inputStream = FileInputStream(file)
-                    binding.pdfView.fromStream(inputStream).load()
+                    binding.pdfView.fromStream(inputStream)
+                        .onLoad { nbPages -> maxPages = nbPages }
+                        .load()
                 }
 
                 override fun onFailure(throwable: Throwable) {
@@ -61,8 +88,6 @@
         Log.d(kTag, "initOnCreate: [$screenWidth, $screenHeight]")
     }
 
-    private var scale = 1f
-
     override fun onKeyDown(keyCode: Int, event: KeyEvent?): Boolean {
         when (keyCode) {
             22 -> {

diff --git a/app/src/main/java/com/casic/br/ar/app/view/PreviewPdfActivity.kt b/app/src/main/java/com/casic/br/ar/app/view/PreviewPdfActivity.kt
index 677aac7..ad3ffa3 100644
--- a/app/src/main/java/com/casic/br/ar/app/view/PreviewPdfActivity.kt
+++ b/app/src/main/java/com/casic/br/ar/app/view/PreviewPdfActivity.kt
@@ -22,13 +22,38 @@
     private val screenWidth by lazy { getScreenWidth() }
     private val screenHeight by lazy { getScreenHeight() }
 
+    //PDF默认缩放比例
+    private var scale = 1f
+
+    //PDF默认页
+    private var offset = 0
+
+    //最大页码
+    private var maxPages = 0
+
     override fun initEvent() {
         binding.topMoveButton.setOnClickListener {
-            binding.pdfView.moveRelativeTo(screenWidth / 2f, screenHeight / 6f)
+            binding.pdfView.moveRelativeTo(screenWidth / 2f, screenHeight / 5f)
+        }
+
+        binding.lastPageButton.setOnClickListener {
+            offset--
+            if (offset <= 0) {
+                offset = 0
+            }
+            binding.pdfView.jumpTo(offset, true)
+        }
+
+        binding.nextPageButton.setOnClickListener {
+            offset++
+            if (offset >= maxPages) {
+                offset = maxPages
+            }
+            binding.pdfView.jumpTo(offset, true)
         }
 
         binding.bottomMoveButton.setOnClickListener {
-            binding.pdfView.moveRelativeTo(screenWidth / 2f, -screenHeight / 6f)
+            binding.pdfView.moveRelativeTo(screenWidth / 2f, -screenHeight / 5f)
         }
     }
 
@@ -50,7 +75,9 @@
                 override fun onDownloadEnd(file: File) {
                     LoadingDialogHub.dismiss()
                     val inputStream = FileInputStream(file)
-                    binding.pdfView.fromStream(inputStream).load()
+                    binding.pdfView.fromStream(inputStream)
+                        .onLoad { nbPages -> maxPages = nbPages }
+                        .load()
                 }
 
                 override fun onFailure(throwable: Throwable) {
@@ -61,8 +88,6 @@
         Log.d(kTag, "initOnCreate: [$screenWidth, $screenHeight]")
     }
 
-    private var scale = 1f
-
     override fun onKeyDown(keyCode: Int, event: KeyEvent?): Boolean {
         when (keyCode) {
             22 -> {
diff --git a/app/src/main/res/drawable/ic_move_page.xml b/app/src/main/res/drawable/ic_move_page.xml
index e190b84..d39c0a8 100644
--- a/app/src/main/res/drawable/ic_move_page.xml
+++ b/app/src/main/res/drawable/ic_move_page.xml
@@ -4,7 +4,7 @@
     android:viewportWidth="1024"
     android:viewportHeight="1024">
     <path
-        android:fillColor="#6184FF"
+        android:fillColor="@color/themeColor"
         android:pathData="M0,512C0,229.2 229.2,0 512,0s512,229.2 512,512 -229.2,512 -512,512S0,794.8 0,512z" />
     <path
         android:fillColor="#FFFFFF"

diff --git a/app/src/main/java/com/casic/br/ar/app/view/PreviewPdfActivity.kt b/app/src/main/java/com/casic/br/ar/app/view/PreviewPdfActivity.kt
index 677aac7..ad3ffa3 100644
--- a/app/src/main/java/com/casic/br/ar/app/view/PreviewPdfActivity.kt
+++ b/app/src/main/java/com/casic/br/ar/app/view/PreviewPdfActivity.kt
@@ -22,13 +22,38 @@
     private val screenWidth by lazy { getScreenWidth() }
     private val screenHeight by lazy { getScreenHeight() }
 
+    //PDF默认缩放比例
+    private var scale = 1f
+
+    //PDF默认页
+    private var offset = 0
+
+    //最大页码
+    private var maxPages = 0
+
     override fun initEvent() {
         binding.topMoveButton.setOnClickListener {
-            binding.pdfView.moveRelativeTo(screenWidth / 2f, screenHeight / 6f)
+            binding.pdfView.moveRelativeTo(screenWidth / 2f, screenHeight / 5f)
+        }
+
+        binding.lastPageButton.setOnClickListener {
+            offset--
+            if (offset <= 0) {
+                offset = 0
+            }
+            binding.pdfView.jumpTo(offset, true)
+        }
+
+        binding.nextPageButton.setOnClickListener {
+            offset++
+            if (offset >= maxPages) {
+                offset = maxPages
+            }
+            binding.pdfView.jumpTo(offset, true)
         }
 
         binding.bottomMoveButton.setOnClickListener {
-            binding.pdfView.moveRelativeTo(screenWidth / 2f, -screenHeight / 6f)
+            binding.pdfView.moveRelativeTo(screenWidth / 2f, -screenHeight / 5f)
         }
     }
 
@@ -50,7 +75,9 @@
                 override fun onDownloadEnd(file: File) {
                     LoadingDialogHub.dismiss()
                     val inputStream = FileInputStream(file)
-                    binding.pdfView.fromStream(inputStream).load()
+                    binding.pdfView.fromStream(inputStream)
+                        .onLoad { nbPages -> maxPages = nbPages }
+                        .load()
                 }
 
                 override fun onFailure(throwable: Throwable) {
@@ -61,8 +88,6 @@
         Log.d(kTag, "initOnCreate: [$screenWidth, $screenHeight]")
     }
 
-    private var scale = 1f
-
     override fun onKeyDown(keyCode: Int, event: KeyEvent?): Boolean {
         when (keyCode) {
             22 -> {
diff --git a/app/src/main/res/drawable/ic_move_page.xml b/app/src/main/res/drawable/ic_move_page.xml
index e190b84..d39c0a8 100644
--- a/app/src/main/res/drawable/ic_move_page.xml
+++ b/app/src/main/res/drawable/ic_move_page.xml
@@ -4,7 +4,7 @@
     android:viewportWidth="1024"
     android:viewportHeight="1024">
     <path
-        android:fillColor="#6184FF"
+        android:fillColor="@color/themeColor"
         android:pathData="M0,512C0,229.2 229.2,0 512,0s512,229.2 512,512 -229.2,512 -512,512S0,794.8 0,512z" />
     <path
         android:fillColor="#FFFFFF"
diff --git a/app/src/main/res/layout/activity_preview_pdf.xml b/app/src/main/res/layout/activity_preview_pdf.xml
index c24437b..e3b4fb2 100644
--- a/app/src/main/res/layout/activity_preview_pdf.xml
+++ b/app/src/main/res/layout/activity_preview_pdf.xml
@@ -29,22 +29,44 @@
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_gravity="end|center_vertical"
-            android:orientation="vertical"
-            android:padding="@dimen/dp_15">
+            android:gravity="center_horizontal"
+            android:orientation="vertical">
 
             <ImageView
                 android:id="@+id/topMoveButton"
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
-                android:layout_marginBottom="@dimen/dp_7"
+                android:padding="@dimen/dp_15"
                 android:rotation="-90"
                 android:src="@drawable/ic_move_page" />
 
+            <TextView
+                android:id="@+id/lastPageButton"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_margin="@dimen/dp_10"
+                android:background="@color/themeColor"
+                android:paddingHorizontal="@dimen/dp_15"
+                android:paddingVertical="@dimen/dp_5"
+                android:text="上一页"
+                android:textColor="@color/white" />
+
+            <TextView
+                android:id="@+id/nextPageButton"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_margin="@dimen/dp_10"
+                android:background="@color/themeColor"
+                android:paddingHorizontal="@dimen/dp_15"
+                android:paddingVertical="@dimen/dp_5"
+                android:text="下一页"
+                android:textColor="@color/white" />
+
             <ImageView
                 android:id="@+id/bottomMoveButton"
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
-                android:layout_marginTop="@dimen/dp_7"
+                android:padding="@dimen/dp_15"
                 android:rotation="90"
                 android:src="@drawable/ic_move_page" />
         </LinearLayout>