Abstract: While Wang Chuanshan reflects and summarizes Neo-Confucianism,he pays close attention to the problem of noumenon and has put forward various conceptions,such as “Taixu”,“Tian”,“Taihe” and “Dao”.Generally speaking,there can be only one noumenon in one theory,so what is its true noumenon?As a matter of fact,the true noumenon is Taiji and he explains it from the perspectives of “Taixu”,“Tian”,“Taihe” and “Dao”,then he makes a further discussion about the nature of “No Beginning of Taiji”.In general,Wangs above theory inherits Zhang Zais theory,and deepens and develops the idea of Yi Zhuan and Taiji Tu Theory.

Key words: Wang Chuanshan, noumenon, Taiji, the ultimate existing everywhere, the ultimate existing nowhere else