diff --git a/scripts/push_ssh_key.py b/scripts/push_ssh_key.py
index 211f542..31e755d 100644
--- a/scripts/push_ssh_key.py
+++ b/scripts/push_ssh_key.py
@@ -1,23 +1,54 @@
 """推公钥到远程服务器 /root/.ssh/authorized_keys。
 
-用法:python _push_key.py
+用法:
+  set REMOTE_PASS=xxx           (Windows PowerShell: $env:REMOTE_PASS='xxx')
+  python scripts/push_ssh_key.py
+
 依赖:paramiko
+
+密钥优先级:id_ed25519.pub > id_rsa.pub(可由环境变量 SSH_PUB_KEY_PATH 覆盖)
+
+去重策略:用 SSH 公钥 fingerprint(SHA256)匹配,而不是用 marker。
+这样同一台机器多次推、不同算法/不同机器都能正确去重。
 """
 import os
+import subprocess
 import sys
+
 import paramiko
 
 HOST = "207.57.129.228"
 PORT = 19717
 USER = "root"
 PASSWORD = os.environ["REMOTE_PASS"]  # 由调用方设置
-PUB_KEY_PATH = os.path.expanduser("~/.ssh/id_rsa.pub")
+# 优先 ed25519,fallback 到 rsa;亦可通过 SSH_PUB_KEY_PATH 指定
+_PUB_KEY_CANDIDATES = ("~/.ssh/id_ed25519.pub", "~/.ssh/id_rsa.pub")
+_candidate = os.environ.get("SSH_PUB_KEY_PATH")
+if _candidate:
+    PUB_KEY_PATH = os.path.expanduser(_candidate)
+else:
+    PUB_KEY_PATH = None
+    for _p in _PUB_KEY_CANDIDATES:
+        _expanded = os.path.expanduser(_p)
+        if os.path.exists(_expanded):
+            PUB_KEY_PATH = _expanded
+            break
+    if PUB_KEY_PATH is None:
+        PUB_KEY_PATH = os.path.expanduser(_PUB_KEY_CANDIDATES[0])  # 默认仍给一个清晰的报错路径
 
 
 def main() -> int:
     pub = open(PUB_KEY_PATH, encoding="utf-8").read().strip()
     print(f"公钥({PUB_KEY_PATH})前 60 字符: {pub[:60]}...")
 
+    # 本地算 fingerprint(SSH 公钥的 SHA256,OpenSSH 标准格式)
+    fp_proc = subprocess.run(
+        ["ssh-keygen", "-lf", PUB_KEY_PATH],
+        capture_output=True, text=True, check=True,
+    )
+    fingerprint = fp_proc.stdout.split()[1]  # 形如 "SHA256:xxxx"
+    print(f"fingerprint: {fingerprint}")
+
     client = paramiko.SSHClient()
     client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
     try:
@@ -32,43 +63,43 @@ def main() -> int:
     # 1) 检查 .ssh 目录
     cmds = [
         "mkdir -p /root/.ssh && chmod 700 /root/.ssh",
-        f"touch /root/.ssh/authorized_keys && chmod 600 /root/.ssh/authorized_keys",
+        "touch /root/.ssh/authorized_keys && chmod 600 /root/.ssh/authorized_keys",
     ]
     for c in cmds:
         _exec(client, c)
 
-    # 2) 检查是否已经存在(去重)
-    stdin, stdout, stderr = client.exec_command("grep -F -c 'news-deploy-key' /root/.ssh/authorized_keys || true")
-    # 用一个独特注释,后续可识别
-    marker = "news-deploy-key"
-    if marker not in pub:
-        pub_with_marker = f"{pub} {marker}"
-    else:
-        pub_with_marker = pub
-    stdin, stdout, stderr = client.exec_command("cat /root/.ssh/authorized_keys | grep -F '" + marker + "' || true")
-    existing = stdout.read().decode().strip()
+    # 2) 用 fingerprint 去重 — 服务器上是否已有这个 key
+    _si, _so, _se = client.exec_command(
+        f"grep -F '{fingerprint}' /root/.ssh/authorized_keys 2>/dev/null || true"
+    )
+    existing = _so.read().decode().strip()
     if existing:
-        print(f"已存在,跳过: {existing[:60]}...")
+        print(f"该 fingerprint 已在 authorized_keys,跳过: {existing.splitlines()[0][:80]}...")
     else:
-        # 写入(用 heredoc 避免转义)
+        # 3) 追加(用 printf %s\\n 避免 echo 的换行问题)
+        marker = "news-deploy-key"
+        if marker not in pub:
+            pub_with_marker = f"{pub} {marker}"
+        else:
+            pub_with_marker = pub
         quoted = pub_with_marker.replace("'", "'\\''")
-        cmd = f"echo '{quoted}' >> /root/.ssh/authorized_keys"
-        _exec(client, cmd)
-        print(f"已追加公钥到 /root/.ssh/authorized_keys")
+        _exec(client, f"printf '%s\\n' '{quoted}' >> /root/.ssh/authorized_keys")
+        print(f"已追加公钥到 /root/.ssh/authorized_keys({fingerprint})")
 
-    # 3) 验证权限
+    # 4) 验证权限
     _exec(client, "ls -la /root/.ssh/ /root/.ssh/authorized_keys")
+    # 5) 列一下当前所有 key
+    _exec(client, "awk '{print NR, $1, $2, $3}' /root/.ssh/authorized_keys")
 
-    # 4) 关闭密码登录(可选项,MVP 保留)
     client.close()
     return 0
 
 
 def _exec(client: paramiko.SSHClient, cmd: str) -> None:
     print(f"$ {cmd}")
-    stdin, stdout, stderr = client.exec_command(cmd, timeout=15)
-    out = stdout.read().decode().strip()
-    err = stderr.read().decode().strip()
+    _si, so, se = client.exec_command(cmd, timeout=15)
+    out = so.read().decode().strip()
+    err = se.read().decode().strip()
     if out:
         print(out)
     if err: