With bamboo strips from Guodian, non-connection between the Heaven and man is a basic thought of early Confucianism. Mencius is different with Xun Zi under the influence of this thought. Non-connection between the Heaven and man in Xun Zi's theory is more complex than the understanding of past scholars. Both Mencius and Xun Zi had considered non-connection between heaven and man, and the unity of the Heaven and man; but they were in different degrees of actions.