Significant growth in the Chinese retail industry has boosted utilization of Enterprise Resource Planning (ERP) systems among Chinese retailers. However, due to the weak information infrastructure of organizations and the inherent complexity of ERP systems, many Chinese retailers have encountered difficulties in achieving the benefits at the post-implementation stage of the ERP deployment. The post-implementation success of the ERP is under researched, though. Therefore, based on the Technology-Organization-Environment (TOE) theory, we develop an integrated model of the post-implementation success of ERP, and empirically test it in the Chinese retail industry. The results show that implementation quality and organizational readiness positively affect the post-implementation success of the ERP, while external support does not exert significant impacts. The research and practical implications of the findings are discussed.