diff --git a/src/components/settings/SettingsModal.tsx b/src/components/settings/SettingsModal.tsx
index b0cd1ee..ad37345 100644
--- a/src/components/settings/SettingsModal.tsx
+++ b/src/components/settings/SettingsModal.tsx
@@ -143,13 +143,19 @@ function AgentSettings() {
   const [thinking, setThinking] = useConfig('agent.enableThinking', true);
   const [thinkingEffort, setThinkingEffort] = useConfig('agent.thinkingEffort', 'high');
 
+  const MAX_ITER_OPTIONS = [10, 20, 50, 85, 128, 256, 512];
+
   return (
     <Stack spacing={2}>
       <Typography variant="subtitle2" sx={{ fontWeight: 600 }}>Agent 配置</Typography>
-      <Box>
-        <Stack direction="row" justifyContent="space-between"><Typography variant="caption" sx={{ color: 'text.secondary' }}>最大迭代次数</Typography><Typography variant="caption" sx={{ fontFamily: 'monospace' }}>{maxIter}</Typography></Stack>
-        <Slider value={maxIter} onChange={(_, v) => setMaxIter(v as number)} min={1} max={50} size="small" />
-      </Box>
+      <FormControl size="small">
+        <InputLabel>最大迭代次数</InputLabel>
+        <Select value={maxIter} label="最大迭代次数" onChange={(e) => setMaxIter(e.target.value as number)}>
+          {MAX_ITER_OPTIONS.map((n) => (
+            <MenuItem key={n} value={n}>{n}</MenuItem>
+          ))}
+        </Select>
+      </FormControl>
       <Box>
         <Stack direction="row" justifyContent="space-between"><Typography variant="caption" sx={{ color: 'text.secondary' }}>总超时 (秒)</Typography><Typography variant="caption" sx={{ fontFamily: 'monospace' }}>{timeout / 1000}s</Typography></Stack>
         <Slider value={timeout / 1000} onChange={(_, v) => setTimeout_((v as number) * 1000)} min={60} max={1800} step={60} size="small" />