This paper analyzes the correlations of Chongqing GDP and its export on the use of the theory of trait root test, co-integration test, error correct model in econometrics after the author makes some statistical analysis on the two kinds of data. The conclusions show that there are the long and stable relationships between these data and there is also a Grange causality from export to GDP. In the end, some countenmea sures are discussed about Chongqing export trade.