diff --git a/src/components/PoDetail/PoDetail.tsx b/src/components/PoDetail/PoDetail.tsx
index 24a46e5..dc092e6 100644
--- a/src/components/PoDetail/PoDetail.tsx
+++ b/src/components/PoDetail/PoDetail.tsx
@@ -329,9 +329,22 @@ const PoDetail: React.FC<Props> = ({ po, warehouse, printerCombo }) => {
     }
   })
 
+  const labelPrinters = useMemo(() => {
+    return (printerCombo ?? []).filter((p) => {
+      const text = `${p.label ?? ""} ${p.name ?? ""} ${p.code ?? ""}`.toLowerCase();
+      return text.includes("label");
+    });
+  }, [printerCombo]);
+
   const [selectedPrinter, setSelectedPrinter] = useState<PrinterCombo | undefined>(
-    printerCombo?.[0],
+    labelPrinters?.[0],
   );
+  useEffect(() => {
+    // If options change, keep selection valid and prefer first Label printer.
+    if (!selectedPrinter || !labelPrinters.some((p) => p.id === selectedPrinter.id)) {
+      setSelectedPrinter(labelPrinters[0]);
+    }
+  }, [labelPrinters, selectedPrinter]);
   const [printQty, setPrintQty] = useState(1);
   const [printDialogOpen, setPrintDialogOpen] = useState(false);
   const [isBulkPrinting, setIsBulkPrinting] = useState(false);
@@ -1052,7 +1065,7 @@ const PoDetail: React.FC<Props> = ({ po, warehouse, printerCombo }) => {
                         <Typography variant="h6">列印</Typography>
                         <Autocomplete
                           disableClearable
-                          options={printerCombo}
+                          options={labelPrinters}
                           value={selectedPrinter}
                           onChange={(_event, value) => setSelectedPrinter(value)}
                           renderInput={(params) => (