The third party reverse logistics outsourcing service provider's evaluation index system was built up from the customers' view in 6 aspects,such as market competitiveness,service ability,coordination ability,information level,safety and compatibility.Then the redundancy of target classification from index membership was cleared by the information entropy index distinguish right,the RMS values were extracted to achieve the transformation of the membership degree step by step,and the evaluation of the comprehensive strength overall goal of the third party reverse logistics provider was realized based on the M(1,2,3)membership conversion algorithm.The comprehensive strength of a Handan service provider was evaluated as an example,and the results show that the overall strength meet with the satisfaction level of the requirements of the customer,and coordination and safety should be further strengthened.