diff --git a/cmd/quota/quota.go b/cmd/quota/quota.go
index e42a51b..dfea133 100644
--- a/cmd/quota/quota.go
+++ b/cmd/quota/quota.go
@@ -20,19 +20,22 @@ var QuotaCmd = &cobra.Command{
 		err := p.Login()
 		if err != nil {
 			logrus.Errorln("Login Failed:", err)
+			return // 加上这行，否则会继续执行
 		}
 		q, err := p.GetQuota()
 		if err != nil {
 			logrus.Errorln("get cloud quota error:", err)
 			return
 		}
+		fmt.Println("Storage:")
 		fmt.Printf("%-20s%-20s\n", "total", "used")
-		switch human {
-		case true:
-			fmt.Printf("%-20s%-20s\n", displayStorage(q.Limit), displayStorage(q.Usage))
-		case false:
-			fmt.Printf("%-20s%-20s\n", q.Limit, q.Usage)
+		if human {
+			fmt.Printf("%-20s%-20s\n", displayStorage(q.Quota.Limit), displayStorage(q.Quota.Usage))
+		} else {
+			fmt.Printf("%-20s%-20s\n", q.Quota.Limit, q.Quota.Usage)
 		}
+
+		displayCloudDownload(q.Quotas.CloudDownload)
 	},
 }
 
@@ -42,15 +45,22 @@ func init() {
 func displayStorage(s string) string {
 	size, _ := strconv.ParseFloat(s, 64)
 	cnt := 0
-	for size > 1024 {
+	for size >= 1024 {
 		cnt += 1
 		if cnt > 5 {
 			break
 		}
 		size /= 1024
 	}
-	// res := strconv.Itoa(int(size))
-	res := strconv.FormatFloat(size, 'g', 2, 64)
+
+	var res string
+	// 如果是整数则不显示小数点
+	if size == float64(int64(size)) {
+		res = strconv.FormatFloat(size, 'f', 0, 64)
+	} else {
+		res = strconv.FormatFloat(size, 'f', 2, 64)
+	}
+
 	switch cnt {
 	case 0:
 		res += "B"
@@ -67,3 +77,14 @@ func displayStorage(s string) string {
 	}
 	return res
 }
+
+func displayCloudDownload(cloudDownload pikpak.Quota) {
+	fmt.Printf("\ncloud download:\n")
+	fmt.Printf("%-20s%-20s%-20s\n", "total", "used", "remaining")
+	remaining, err := cloudDownload.Remaining()
+	if err != nil {
+		fmt.Printf("%-20s%-20s%-20s\n", cloudDownload.Limit, cloudDownload.Usage, "N/A")
+		return
+	}
+	fmt.Printf("%-20s%-20s%-20d\n", cloudDownload.Limit, cloudDownload.Usage, remaining)
+}
diff --git a/internal/pikpak/pikpak.go b/internal/pikpak/pikpak.go
index 99c1269..ff160d7 100644
--- a/internal/pikpak/pikpak.go
+++ b/internal/pikpak/pikpak.go
@@ -37,11 +37,11 @@ func NewPikPak(account, password string) PikPak {
 		},
 	}
 	if conf.Config.UseProxy() {
-		url, err := url.Parse(conf.Config.Proxy)
+		proxyUrl, err := url.Parse(conf.Config.Proxy)
 		if err != nil {
 			logrus.Errorln("url parse proxy error", err)
 		}
-		p := http.ProxyURL(url)
+		p := http.ProxyURL(proxyUrl)
 		client.Transport = &http.Transport{
 			Proxy: p,
 		}
@@ -58,7 +58,8 @@ func NewPikPak(account, password string) PikPak {
 	}
 }
 
-func (p *PikPak) Login() error {
+// login 执行完整登录流程
+func (p *PikPak) login() error {
 	captchaToken, err := p.getCaptchaToken()
 	if err != nil {
 		return err
@@ -147,3 +148,23 @@ func (p *PikPak) setHeader(req *http.Request) {
 	req.Header.Set("User-Agent", userAgent)
 	req.Header.Set("X-Device-Id", p.DeviceId)
 }
+
+// Login 优先复用本地 session，必要时才走完整登录
+func (p *PikPak) Login() error {
+	if err := p.loadSession(); err == nil {
+		if !p.isTokenExpired() {
+			logrus.Debugln("session valid, skip login")
+			return nil
+		}
+		logrus.Debugln("access_token expired, trying refresh_token")
+		if err = p.RefreshToken(); err == nil {
+			return p.saveSession()
+		}
+		logrus.Debugln("refresh failed, fallback to full login")
+	}
+	if err := p.login(); err != nil {
+		return err
+	}
+	// 执行了完整登录流程，保存session
+	return p.saveSession()
+}
diff --git a/internal/pikpak/quota.go b/internal/pikpak/quota.go
index 1c566f8..5a26ceb 100644
--- a/internal/pikpak/quota.go
+++ b/internal/pikpak/quota.go
@@ -2,11 +2,12 @@ package pikpak
 
 import (
 	"net/http"
+	"strconv"
 
 	jsoniter "github.com/json-iterator/go"
 )
 
-type quotaMessage struct {
+type QuotaMessage struct {
 	Kind      string `json:"kind"`
 	Quota     Quota  `json:"quota"`
 	ExpiresAt string `json:"expires_at"`
@@ -21,23 +22,37 @@ type Quota struct {
 	PlayTimesUsage string `json:"play_times_usage"`
 }
 
+// Remaining 剩余额度
+func (q Quota) Remaining() (int64, error) {
+	limit, err := strconv.ParseInt(q.Limit, 10, 64)
+	if err != nil {
+		return 0, err
+	}
+	usage, err := strconv.ParseInt(q.Usage, 10, 64)
+	if err != nil {
+		return 0, err
+	}
+	return limit - usage, nil
+}
+
 type Quotas struct {
+	CloudDownload Quota `json:"cloud_download"`
 }
 
-// get cloud quota
-func (p *PikPak) GetQuota() (Quota, error) {
+// GetQuota get cloud quota
+func (p *PikPak) GetQuota() (QuotaMessage, error) {
 	req, err := http.NewRequest("GET", "https://api-drive.mypikpak.com/drive/v1/about", nil)
 	if err != nil {
-		return Quota{}, err
+		return QuotaMessage{}, err
 	}
 	bs, err := p.sendRequest(req)
 	if err != nil {
-		return Quota{}, err
+		return QuotaMessage{}, err
 	}
-	var quotaMessage quotaMessage
+	var quotaMessage QuotaMessage
 	err = jsoniter.Unmarshal(bs, &quotaMessage)
 	if err != nil {
-		return Quota{}, err
+		return QuotaMessage{}, err
 	}
-	return quotaMessage.Quota, nil
+	return quotaMessage, nil
 }
diff --git a/internal/pikpak/refresh_token.go b/internal/pikpak/refresh_token.go
index ced2acc..5bef698 100644
--- a/internal/pikpak/refresh_token.go
+++ b/internal/pikpak/refresh_token.go
@@ -35,7 +35,7 @@ func (p *PikPak) RefreshToken() error {
 		// refresh token failed
 		if error_code == 4126 {
 			// 重新登录
-			return p.Login()
+			return p.login()
 		}
 		return fmt.Errorf("refresh token error message: %d", gjson.GetBytes(bs, "error").Int())
 	}
diff --git a/internal/pikpak/session.go b/internal/pikpak/session.go
new file mode 100644
index 0000000..95e28af
--- /dev/null
+++ b/internal/pikpak/session.go
@@ -0,0 +1,87 @@
+package pikpak
+
+import (
+	"crypto/md5"
+	"encoding/hex"
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+	"time"
+
+	"github.com/sirupsen/logrus"
+)
+
+// sessionData 是持久化到磁盘的数据结构
+type sessionData struct {
+	JwtToken     string `json:"access_token"`
+	RefreshToken string `json:"refresh_token"`
+	Sub          string `json:"sub"`
+	// ExpiresAt 是 access_token 的过期 Unix 时间戳（秒）
+	ExpiresAt int64 `json:"expires_at"`
+}
+
+// saveSession 将当前 token 信息持久化到本地文件
+func (p *PikPak) saveSession() error {
+	path, err := sessionFile(p.Account)
+	if err != nil {
+		return err
+	}
+	data := sessionData{
+		JwtToken:     p.JwtToken,
+		RefreshToken: p.refreshToken,
+		Sub:          p.Sub,
+		// RefreshSecond 是服务端返回的 expires_in（秒），提前 5 分钟视为过期
+		ExpiresAt: time.Now().Unix() + p.RefreshSecond - 300,
+	}
+
+	bs, err := json.Marshal(data)
+	if err != nil {
+		return fmt.Errorf("marshal session error: %w", err)
+	}
+	if err = os.WriteFile(path, bs, 0600); err != nil {
+		return fmt.Errorf("write session file error: %w", err)
+	}
+	logrus.Debugln("session saved to", path)
+	return nil
+}
+
+// loadSession 从本地文件加载 token，并写回到 PikPak 实例
+// 如果文件不存在或账号不匹配，返回 error
+func (p *PikPak) loadSession() error {
+	path, err := sessionFile(p.Account)
+	if err != nil {
+		return err
+	}
+	bs, err := os.ReadFile(path)
+	if err != nil {
+		return fmt.Errorf("read session file error: %w", err)
+	}
+	var data sessionData
+	if err = json.Unmarshal(bs, &data); err != nil {
+		return fmt.Errorf("unmarshal session error: %w", err)
+	}
+
+	p.JwtToken = data.JwtToken
+	p.refreshToken = data.RefreshToken
+	p.Sub = data.Sub
+	p.RefreshSecond = data.ExpiresAt - time.Now().Unix()
+	logrus.Debugln("session loaded from", path)
+	return nil
+}
+
+// isTokenExpired 判断 access_token 是否已过期（或即将过期）
+// RefreshSecond 在 loadSession 后表示距过期的剩余秒数
+func (p *PikPak) isTokenExpired() bool {
+	return p.RefreshSecond <= 0
+}
+
+func sessionFile(account string) (string, error) {
+	configDir, err := os.UserConfigDir()
+	if err != nil {
+		return "", fmt.Errorf("get config dir error: %w", err)
+	}
+	hash := md5.Sum([]byte(account))
+	filename := fmt.Sprintf("session_%s.json", hex.EncodeToString(hash[:]))
+	return filepath.Join(configDir, "pikpakcli", filename), nil
+}