diff --git a/examples/janus/janus/train/mix_dataset.py b/examples/janus/janus/train/mix_dataset.py
new file mode 100644
index 0000000000..3d727347a5
--- /dev/null
+++ b/examples/janus/janus/train/mix_dataset.py
@@ -0,0 +1,130 @@
+import bisect
+
+import mindspore as ms
+import numpy as np
+from mindspore.dataset import WeightedRandomSampler, DistributedSampler
+
+from janus.models import VLChatProcessor
+from janus.train.t2i_dataset import TextImageDataset
+from janus.train.text_dataset import TextDataset
+from janus.train.vqa_dataset import VqaDataset
+
+
+class  MixDataset:
+    """
+    Mixed dataset that outputs pure text, multi-modal and text-to-image data.
+    """
+    @staticmethod
+    def cumsum(sequence):
+        r, s = [], 0
+        for e in sequence:
+            l = len(e)
+            r.append(l + s)
+            s += l
+        return r
+
+    def __init__(self, datasets, default_image_shape=(1, 3, 384, 384), max_token_length=1024):
+        self.default_image_shape = default_image_shape
+        self.max_token_length = max_token_length
+        self.datasets = datasets
+        self.num_dataset = len(datasets)
+        self.cumulative_sizes = self.cumsum(self.datasets)
+
+    def __getitem__(self, idx):
+        dataset_idx = bisect.bisect_right(self.cumulative_sizes, idx)
+        if dataset_idx ==0:
+            sample_idx = idx
+        else:
+            sample_idx = idx - self.cumulative_sizes[dataset_idx - 1]
+
+        ret = self.datasets[dataset_idx][sample_idx]
+
+        # add image and image_seq_mask item to pure text for batching
+        if dataset_idx == 0:
+            image = np.zeros(self.default_image_shape, np.float32)
+            image_seq_mask = np.zeros((self.max_token_length), dtype=np.bool)
+            ret += (image_seq_mask, image)
+
+        return ret
+
+    def __len__(self):
+        return self.cumulative_sizes[-1]
+
+
+def create_mix_dataloader(
+                          vl_chat_processor,
+                          t2i_csv_path="./datasets/jade/csvfile/image_text_en.csv",
+                          t2i_data_dir="./datasets",
+                          text_dataset_name="pubmedqa",
+                          text_data_dir="./datasets/PubMedQA",
+                          vqa_dataset_name="medical-vqa",
+                          vqa_data_dir="./datasets/medical-vqa",
+                          max_token_length=1024,
+                          image_size=384,
+                          null_prompt_prob=0.0,
+                          batch_size=1,
+                          num_parallel_workers=1,
+                          rank=0,
+                          rank_size=1,
+                          num_samples=100,
+                          sample_ratios=(1, 5, 4)):
+
+    dataset_text = TextDataset(
+        dataset_name=text_dataset_name,
+        data_dir=text_data_dir,
+        vl_chat_processor=vl_chat_processor,
+        max_token_length=max_token_length,
+        num_samples=num_samples,
+    )
+
+    dataset_t2i = TextImageDataset(
+        csv_path=t2i_csv_path,
+        data_dir=t2i_data_dir,
+        vl_chat_processor=vl_chat_processor,
+        max_token_length=max_token_length,
+        image_size=image_size,
+        null_prompt_prob=null_prompt_prob,
+        num_samples=num_samples,
+    )
+
+    dataset_vqa = VqaDataset(
+        dataset_name=vqa_dataset_name,
+        data_dir=vqa_data_dir,
+        vl_chat_processor=vl_chat_processor,
+        max_token_length=max_token_length,
+        num_samples=num_samples,
+    )
+
+    datasets =  [dataset_text, dataset_vqa, dataset_t2i]  # keep the right order
+    mix_dataset = MixDataset(datasets=datasets,
+                             default_image_shape=(1, 3, image_size, image_size),
+                             max_token_length=max_token_length)
+
+    sample_weights = []
+    assert len(sample_ratios) == len(datasets)
+    for i in range(len(sample_ratios)):
+        weight = sample_ratios[i] * len(mix_dataset) / len(datasets[i])
+        sample_weights += [weight] * len(datasets[i])
+
+    sampler = DistributedSampler(num_shards=rank_size, shard_id=rank, shuffle=False)
+    sampler.add_child(WeightedRandomSampler(weights=sample_weights, num_samples=len(sample_weights), replacement=True))
+
+    dataloader = ms.dataset.GeneratorDataset(
+        source=mix_dataset,
+        sampler=sampler,
+        column_names=["task_type", "input_ids", "labels", "attention_mask", "image_seq_mask", "image"],
+        num_parallel_workers=num_parallel_workers,
+        python_multiprocessing=True,
+    )
+
+    dataloader = dataloader.batch(batch_size, drop_remainder=True)
+
+    return dataloader
+
+if __name__ == "__main__":
+    pretrain_model_path = "./ckpts/Janus-Pro-1B"
+    vl_chat_processor = VLChatProcessor.from_pretrained(pretrain_model_path)
+    dataloader = create_mix_dataloader(vl_chat_processor, batch_size=2)
+    for data in dataloader.create_dict_iterator():
+        print(data)
+        break