The article discusses ByteDance's large-scale MBTI testing on models, revealing that different models exhibit distinct personality traits. The test results indicate that the large model GPT-4 falls into the INTJ personality type, ChatGPT into ENTJ, and the Bloom model into ISTJ. Additionally, different models show varying tendencies across the four dimensions, with larger model parameters potentially leaning more towards the "i" type. Researchers also found through prompt engineering that the personalities of large models can be altered through simple prompting methods, although this is influenced by the model's understanding capabilities and training datasets. Overall, this study provides a preliminary exploration of large model personalities, offering a reference for further understanding of their character traits.