This paper attempts to analyze economic integration of China and Southeast Asian countries. This paper adopts several methods: One, stationarity for correlation, Error Correction Model (ECM) for short-run relation and Cointegration for long-run relations. Two, Structural Vector Autoregression (SVAR) analysis to identify the cause and impact. As stock market index follows real sector performance this paper utilizes: One, elasticity analysis of economic growth between China and these countries as a proxy for real sector economic relations between them and two, descriptive statistical analysis on real effective exchange rate as well as Current Account Balance as a proxy of external economic performance between them. In correlation analysis, this paper found that one, stationarity of each country is difference at level; two, short-run economic relations (ECM) between China and these Southeast Asian countries and three, they have long-run economic relations. In causality, this paper found that China affects all of these Southeast Asian countries and no causality between Singapore and Philippines. In term of real sector analysis this paper found that, one, economic growth in China signiﬁcantly affects all of these countries’ economic growth. Two, external economic performance of these countries are difference with special ﬁnding on Indonesia’s current account.