Pang Pu discovers that “three” is the code of Chinese culture, traces to its source and explains the meaning. He uses this code to open the lock of Chinese cultural treasures, and proposes that “three” means “center worship” and “center worship” means “harmony”. Conversely, he uses the unlocked Chinese cultural treasure to prove the existence of code, and forms a theoretical system of thought to study Chinese culture. Pang Pu’s study on the Chinese cultural code “three” has important methodological significance for the correct understanding of social real life.