diff --git a/src/llamafactory/data/mm_plugin.py b/src/llamafactory/data/mm_plugin.py
index 0f6f0973..91b801dc 100644
--- a/src/llamafactory/data/mm_plugin.py
+++ b/src/llamafactory/data/mm_plugin.py
@@ -1885,8 +1885,14 @@ class Qwen2OmniPlugin(Qwen2VLPlugin):
             image_grid_thw = mm_inputs.get("image_grid_thw", [])
             video_grid_thw = mm_inputs.get("video_grid_thw", [])
             if "feature_attention_mask" in mm_inputs:
-                input_lengths = (mm_inputs["feature_attention_mask"].sum(-1).numpy() - 1) // 2 + 1
-                audio_lengths = (input_lengths - 2) // 2 + 1
+                if processor.__class__.__name__ == "Qwen3OmniMoeProcessor":  # for qwen3omni
+                    input_lengths = mm_inputs["feature_attention_mask"].sum(-1)
+                    input_lengths_leave = input_lengths % 100
+                    feature_lengths = (input_lengths_leave - 1) // 2 + 1
+                    audio_lengths = ((feature_lengths - 1) // 2 + 1 - 1) // 2 + 1 + (input_lengths // 100) * 13
+                else:
+                    input_lengths = (mm_inputs["feature_attention_mask"].sum(-1).numpy() - 1) // 2 + 1
+                    audio_lengths = (input_lengths - 2) // 2 + 1
         else:
             mm_inputs = {}
             image_grid_thw = [None] * len(images)