diff --git a/meme_generator/memes/crawl/__init__.py b/meme_generator/memes/crawl/__init__.py
index 1fc13165..b04534c3 100644
--- a/meme_generator/memes/crawl/__init__.py
+++ b/meme_generator/memes/crawl/__init__.py
@@ -12,6 +12,7 @@
     ParserOption,
     add_meme,
 )
+from meme_generator.exception import MemeFeedback
 
 img_dir = Path(__file__).parent / "images"
 
@@ -37,10 +38,12 @@ class Model(MemeArgsModel):
 
 def crawl(images: list[BuildImage], texts: list[str], args: Model):
     total_num = 92
-    if 1 <= args.number <= total_num:
+    if args.number == 0:
+        num = random.randint(1, total_num)
+    elif 1 <= args.number <= total_num:
         num = args.number
     else:
-        num = random.randint(1, total_num)
+        raise MemeFeedback(f"图片编号错误，请选择 1~{total_num}")
 
     img = images[0].convert("RGBA").circle().resize((100, 100))
     frame = BuildImage.open(img_dir / f"{num:02d}.jpg")
diff --git a/meme_generator/memes/firefly_holdsign/__init__.py b/meme_generator/memes/firefly_holdsign/__init__.py
index dfdcc9b8..219719dd 100644
--- a/meme_generator/memes/firefly_holdsign/__init__.py
+++ b/meme_generator/memes/firefly_holdsign/__init__.py
@@ -12,7 +12,7 @@
     ParserOption,
     add_meme,
 )
-from meme_generator.exception import TextOverLength
+from meme_generator.exception import MemeFeedback, TextOverLength
 from meme_generator.tags import MemeTags
 
 img_dir = Path(__file__).parent / "images"
@@ -40,10 +40,12 @@ class Model(MemeArgsModel):
 def firefly_holdsign(images, texts: list[str], args: Model):
     text = texts[0]
     total_num = 21
-    if 1 <= args.number <= total_num:
+    if args.number == 0:
+        num = random.randint(1, total_num)
+    elif 1 <= args.number <= total_num:
         num = args.number
     else:
-        num = random.randint(1, total_num)
+        raise MemeFeedback(f"图片编号错误，请选择 1~{total_num}")
 
     params = [
         ((300, 200), (144, 322), ((0, 66), (276, 0), (319, 178), (43, 244))),
diff --git a/meme_generator/memes/look_flat/__init__.py b/meme_generator/memes/look_flat/__init__.py
index 3e85321c..2e7812b0 100644
--- a/meme_generator/memes/look_flat/__init__.py
+++ b/meme_generator/memes/look_flat/__init__.py
@@ -10,7 +10,7 @@
     ParserOption,
     add_meme,
 )
-from meme_generator.exception import TextOverLength
+from meme_generator.exception import MemeFeedback, TextOverLength
 from meme_generator.utils import make_jpg_or_gif
 
 help_text = "图片“压扁”比例，默认为 2"
@@ -37,6 +37,8 @@ class Model(MemeArgsModel):
 def look_flat(images: list[BuildImage], texts: list[str], args: Model):
     text = texts[0] if texts else default_text
     ratio = args.ratio
+    if not 1 <= ratio < images[0].height:
+        raise MemeFeedback("请输入合适的“压扁”比例")
 
     img_w = 500
     text_h = 80