diff --git a/monitor/runtime_config.py b/monitor/runtime_config.py
index 4185672..1c3c7c9 100644
--- a/monitor/runtime_config.py
+++ b/monitor/runtime_config.py
@@ -306,6 +306,8 @@ GO_ENV_SPECS_BY_PRIMARY = {spec["primary"]: spec for spec in GO_ENV_SPECS}
 
 # 远端文件不存在时，用固定标记避免和 shell 错误混淆。
 REMOTE_FILE_MISSING_MARKER = "__HY_APP_MONITOR_FILE_MISSING__"
+# TAT 单次输出有长度上限，读取较大的 env / compose 文件时需要分块。
+REMOTE_TEXT_CHUNK_BYTES = 4096
 
 
 def go_service_hosts() -> list[dict[str, Any]]:
@@ -391,7 +393,7 @@ def remote_host_result(host: dict[str, Any], script: str, command_name: str, *,
     return result
 
 
-def read_remote_text(host: dict[str, Any], path: str) -> str:
+def remote_file_size(host: dict[str, Any], path: str) -> int:
     quoted_path = shlex.quote(path)
     script = f"""set -eu
 FILE={quoted_path}
@@ -399,13 +401,54 @@ if [ ! -f "$FILE" ]; then
   printf '%s' {shlex.quote(REMOTE_FILE_MISSING_MARKER)}
   exit 0
 fi
-cat "$FILE"
+python3 - "$FILE" <<'PY'
+from pathlib import Path
+import sys
+
+print(Path(sys.argv[1]).stat().st_size, end="")
+PY
 """
-    result = remote_host_result(host, script, f"read-{host['host']}-service-env")
+    result = remote_host_result(host, script, f"stat-{host['host']}-remote-file")
     output = str(result.get("output") or "")
     if output.strip() == REMOTE_FILE_MISSING_MARKER:
         raise RuntimeError(f"{host['host']} missing file: {path}")
-    return output
+    return int(output.strip() or "0")
+
+
+def read_remote_text(host: dict[str, Any], path: str) -> str:
+    quoted_path = shlex.quote(path)
+    file_size = remote_file_size(host, path)
+    if file_size == 0:
+        return ""
+
+    # 通过多次小输出读取完整文件，避免 TAT 把大文本截断。
+    chunks: list[bytes] = []
+    for offset in range(0, file_size, REMOTE_TEXT_CHUNK_BYTES):
+        script = f"""set -eu
+FILE={quoted_path}
+if [ ! -f "$FILE" ]; then
+  printf '%s' {shlex.quote(REMOTE_FILE_MISSING_MARKER)}
+  exit 0
+fi
+python3 - "$FILE" {offset} {REMOTE_TEXT_CHUNK_BYTES} <<'PY'
+from pathlib import Path
+import base64
+import sys
+
+path = Path(sys.argv[1])
+offset = int(sys.argv[2])
+chunk_size = int(sys.argv[3])
+data = path.read_bytes()[offset : offset + chunk_size]
+print(base64.b64encode(data).decode("ascii"), end="")
+PY
+"""
+        result = remote_host_result(host, script, f"read-{host['host']}-remote-file-chunk-{offset}")
+        output = str(result.get("output") or "")
+        if output.strip() == REMOTE_FILE_MISSING_MARKER:
+            raise RuntimeError(f"{host['host']} missing file: {path}")
+        chunks.append(base64.b64decode(output.strip() or ""))
+
+    return b"".join(chunks).decode("utf-8")
 
 
 def write_remote_text(host: dict[str, Any], path: str, content: str) -> None: