Our study use the conception of Kang and Fratianni (2006) to make the Gravity function addressed by Bergstrand (1985, 1989) as a kind of export production function, then assess the changes of trade efficiency before and after ASEAN plus one on China, Japan, Korea, Taiwan and ASEAN countries by using the Stochastic Production Function Model amended by Battese and Coelli (1995). Though this study, we figure out the influence of ASEAN plus one to East Asia countries, analyze several management variables to comprehend how it works on trade efficiency, and make conclusions based on our empirical analysis.