AI image generation tool Midjourney has recently introduced a feature called Style Tuner, which allows users to train their unique image creation styles by selecting sample images of different styles. Once the training is complete, Midjourney generates a corresponding style code that can be incorporated into subsequent generation prompts to apply the trained style. Users can also repeatedly select images for style adjustments without consuming additional GPU time. Additionally, Midjourney supports importing and using style codes shared by others, as well as combining multiple style codes to control the generation effects. It's important to note that styles are optimized for specific prompts and may not perfectly transfer to other themes. Compared to fixed official styles, this feature significantly enhances Midjourney's capabilities in personalization and customization.