diff --git a/lib/components/task.dart b/lib/components/task.dart
index 16bf509..7f292ae 100644
--- a/lib/components/task.dart
+++ b/lib/components/task.dart
@@ -39,7 +39,11 @@ class _TaskView extends State<TaskView> {
     switch (widget.task.base.type) {
       case TaskType.download:
         final progress = widget.task.progress as TaskDownloadProgess;
-        return progress.downloadedPage / progress.totalPage;
+        double d = progress.downloadedPage.toDouble();
+        for (final e in progress.details) {
+          d += e.total == 0 ? 0 : e.downloaded / e.total;
+        }
+        return d / progress.totalPage;
       case TaskType.exportZip:
         final progress = widget.task.progress as TaskExportZipProgress;
         return progress.addedPage / progress.totalPage;
diff --git a/lib/dialog/task_page.dart b/lib/dialog/task_page.dart
index 370da69..09643fc 100644
--- a/lib/dialog/task_page.dart
+++ b/lib/dialog/task_page.dart
@@ -147,7 +147,11 @@ class _TaskPage extends State<TaskPage> {
         }
       }
       if (p.failedPage == 0) {
-        final percent = p.downloadedPage / p.totalPage;
+        double downloaded = p.downloadedPage.toDouble();
+        for (final e in p.details) {
+          downloaded += e.total == 0 ? 0 : e.downloaded / e.total;
+        }
+        final percent = downloaded / p.totalPage;
         final percentText = "${(percent * 100).toStringAsFixed(2)}%";
         return Column(children: [
           LinearPercentIndicator(