The uncertainty of product demand makes enterprises often have temporary or sudden logistics demands. The logistics services spot market plays an important role in responding to those logistics demands. In the logistics service purchasing process, the price discount provided by long-term procurement contract is affected by the purchase quantity, so for the shipping enterprise, how to balance the long-term procurement contract and spot market procurement to achieve minimum overall procurement cost on the basis of the logistics demand, is a problem needed to be solved. Based on the viewpoint of the shipper, this paper establishes a transport services hybrid procurement model which takes the minimum transportation service procurement cost and maximum overall satisfaction as the objectives considering the factors including carrier and shipper preference, carrier's total discount, and carrier's capacity acceptance range. Then we design a multi-objective particle swarm optimization(PSO) algorithm to solve the proposed model. In order to verify the effectiveness of the proposed model and algorithm, an example analysis is carried out, and the results show that the established model can significantly reduce the total procurement cost of transportation services and effectively improve the overall satisfaction level. Therefore, the research results have a certain theoretical significance on reducing the cost of transportation service procurement and promoting the stable cooperation between the carrier and shipper.