diff --git a/deblistmodel.cpp b/deblistmodel.cpp
index 96debd80727de4279a3fe7b22731fd4f26f9d8b9..7c8dd978916011f2183687fdf7e945c9571bddea 100644
--- a/deblistmodel.cpp
+++ b/deblistmodel.cpp
@@ -381,7 +381,14 @@ void DebListModel::onDependsInstallTransactionFinished()
     if (ret)
         bumpInstallIndex();
     else
+    {
+        // dependencies are installed and the apt cache has changed,
+        // invalidate the cached depends status (and reload the cache) so
+        // installNextDeb() re-checks against the fresh package database
+        // instead of installing the same dependencies again.
+        m_packagesManager->resetPackageDependsStatus(m_operatingIndex);
         installNextDeb();
+    }
 }
 
 void DebListModel::installNextDeb()
@@ -392,7 +399,8 @@ void DebListModel::installNextDeb()
     if (isDpkgRunning())
     {
         qDebug() << "dpkg running, waitting...";
-        QTimer::singleShot(1000 * 5, this, &DebListModel::installNextDeb);
+        // 缩短检查的时间，每隔1S检查当前dpkg是否正在运行，减少安装前的等待。
+        QTimer::singleShot(1000 * 1, this, &DebListModel::installNextDeb);
         return;
     }
 
@@ -402,8 +410,17 @@ void DebListModel::installNextDeb()
     auto const backend = m_packagesManager->m_backendFuture.result();
     Transaction *trans = nullptr;
 
-    // reset package depends status
-    m_packagesManager->resetPackageDependsStatus(m_operatingIndex);
+    // If package is first package and its depends status is already cached,
+    // nothing has been installed yet, so the apt cache is unchanged.
+    // Skip resetPackageDependsStatus() to avoid the long UI freeze caused
+    // by the synchronous reloadCache() and the depends re-check.
+    const bool isFirstPackageAndCached = (0 == m_operatingIndex) && m_packagesManager->cachedPackageDependStatus(m_operatingIndex);
+    if (!isFirstPackageAndCached)
+    {
+        // reset package depends status
+        // The apt backend cache may changed, refresh package status.
+        m_packagesManager->resetPackageDependsStatus(m_operatingIndex);
+    }
 
     // check available dependencies
     const auto dependsStat = m_packagesManager->packageDependsStatus(m_operatingIndex);
diff --git a/packagesmanager.cpp b/packagesmanager.cpp
index 524f607dd52c8590c774b3c402afa2d3f9cbb8ce..d71b9f398d20fc6ddb2f10a2d2db7af4ceb6e743 100644
--- a/packagesmanager.cpp
+++ b/packagesmanager.cpp
@@ -366,6 +366,11 @@ PackageDependsStatus PackagesManager::packageDependsStatus(const int index)
     return ret;
 }
 
+bool PackagesManager::cachedPackageDependStatus(const int index) const
+{
+    return m_packageDependsStatus.contains(index);
+}
+
 const QString PackagesManager::packageInstalledVersion(const int index)
 {
     Q_ASSERT(m_packageInstallStatus.contains(index));
diff --git a/packagesmanager.h b/packagesmanager.h
index 9d04255bff550d867de9cc4322d548482f59e159..72cf4d8a1381659c5b40c0ecdbfe74cadf983d16 100644
--- a/packagesmanager.h
+++ b/packagesmanager.h
@@ -81,6 +81,7 @@ public:
     const ConflictResult isConflictSatisfy(const QString &arch, const QList<QApt::DependencyItem> &conflicts);
     int packageInstallStatus(const int index);
     PackageDependsStatus packageDependsStatus(const int index);
+    bool cachedPackageDependStatus(const int index) const;
     const QString packageInstalledVersion(const int index);
     const QStringList packageAvailableDepends(const int index);
     void packageCandidateChoose(QSet<QString> &choosed_set, const QString &debArch, const QList<QApt::DependencyItem> &dependsList);