diff --git a/src/analyzer/mod.rs b/src/analyzer/mod.rs
index 5560064..c934a13 100644
--- a/src/analyzer/mod.rs
+++ b/src/analyzer/mod.rs
@@ -1,3 +1,10 @@
+use rpm_rs::rpm::{
+    get_installed_packages,
+    Package,
+};
+
+use rpm_rs::rpmio::rpmvercmp;
+
 use crate::cli::Cli;
 
 pub mod db;
@@ -35,5 +42,36 @@ fn repoter(cli: &Cli) -> crate::Result<()> {
 }
 
 fn summary(cli: &Cli) -> crate::Result<()> {
+    // 当前系统所有已安装的 rpm 包
+    let installed = get_installed_packages();
+    // installed 已被消费掉
+    // latest_installed 是所有最新版本软件包的 Vec
+    let latest_installed: Vec<Package> = installed.into_iter().map(|(_, pkgs)| {
+        let mut latest = pkgs[0].clone();
+        for pkg in pkgs.into_iter() {
+            latest = rpmdb_package_vercmp(latest, pkg);
+        }
+        latest
+    }).collect();
+
+    // 列出所有已安装的软件包
+    // latest_installed.iter().for_each(|pkg| println!("{}", pkg.nevra()));
+
     Ok(())
 }
+
+// 对比两个 rpm Package 的版本，返回最新的一个
+fn rpmdb_package_vercmp(pa: Package, pb: Package) -> Package {
+    // 首先进行 epoch 的比较
+    match (pa.epoch(), pb.epoch()) {
+        (Some(_), None) => return pa,
+        (None, Some(_)) => return pb,
+        _ => {}, // 继续往下对比
+    }
+
+    if rpmvercmp(&pa.evr(), &pb.evr()) > 0 {
+        return pa
+    } else {
+        return pb
+    }
+}
diff --git a/src/lib.rs b/src/lib.rs
index 6923b34..bd7bc79 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -11,5 +11,8 @@ pub type Result<T> = std::result::Result<T, Error>;
 
 pub fn cumain() -> Result<()> {
     let cli = cli::parse();
+    // 初始化使用 rpm 默认配置
+    rpm_rs::configure();
+
     analyzer::cuvat_run(&cli)
 }