The proposition for the thought of minben in Mencius could be divided into five categories: the purposive proposition,institutional proposition,normative proposition,operational proposition and critical proposition,which were interrelated,mutually complementary,of different function and same orientation.The question forwarding,interpreting mode,proposition combination,theoretical structure and political inclination in Mencius had a general meaning.From the perspective of proposition combination,the Fundamentalist Confucianism(yuan dian ru xue) and the Autocratic Confucianism(zhuan zhi ru xue) have no intrinsic difference.Therefore,Fundamentalist Confucianism was a spiritual phenomenon that was matched to monarchy.This was the fundamental reason why the doctrine of Confucius and Mencius had become the ruling thoughts of autocratic monarchy in Imperial China.