Integration technologies between heterogeneous systems are hot and difficult points. Architecture framework of enterprise application integration platform based on the JCA(J2EE Connector Architecture) was built, the detailed function s and working mechanism of each module platform works were analyzed in the paper. Some key technologies of achieving system integration between MES (manufacturing execution systems) and ERP (enterprise resource planning) were discussed, including the JCA technology, XML technology and message-driven Bean technology. Finally, an example was given on system integration methods.