diff --git a/internal/device/h3c.go b/internal/device/h3c.go
index 035d122..887cd9b 100644
--- a/internal/device/h3c.go
+++ b/internal/device/h3c.go
@@ -32,6 +32,7 @@ func (p *H3CParser) Parse(device *models.Device, outputs []string) error {
 	}
 
 	// outputs[0] 是 screen-length disable 的输出（通常为空）
+	fmt.Printf("[H3C DEBUG] screen-length disable output: %q (length: %d)\n", outputs[0], len(outputs[0]))
 	p.parseVersion(device, outputs[1])  // outputs[1] 是 display version
 	
 	// outputs[2] 是 display interface