Urban logistic capability is an importation area of urban competition capability. The competitiveness index system of city logistics service outsourcing was constructed in this paper. According the actual situation of 4 cities in China's Yangtze River delta, the competitiveness evaluation of logistics service outsourcing of them were carried out based on TOPSIS method. Furthermore, by comparing we can discover the experience and main existing problems of urban logistics service outsourcing, so as for the feasible countermeasures of development to provide the scientific basis. The evaluation method has certain practical value.