The index system selects certain indicators from five perspectives such as port efficiency,tariff environment,infrastructure and service,information and communication technology and business environment.Analytic Hierarchy Process(AHP)was used to construct a comprehensive index system of trade facilitation under open environment,and Delphi method was used to identify the weight of each index.The empirical results of trade facilitation on China's 25 major trading partners showed that China's level of trade fa...