There are rich and profound studies about Mencius thought, however, there is not so much reseach on Mencius aesthetics. There are still many aspects to be further studied on Mencius concept of Fullness is beauty. Mencius regards the effective communion as the foundation of Fullness. He affirms the meaning of body and reveals the internal consistency of Beauty and Goodness. This concept means Beauty is a dynamic process that need to be realized. It's of great significance in the history of Chinese aesthetics.