The work aims to study the impact of tightness degree in cooperative empty container repositioning between shipping companies on the total cost of empty container repositioning. Considering empty container repositioning time window, with the minimization of the total cost of empty container repositioning as objective, the decision model of shipping alliance empty container repositioning was established. Then, through a specific example, the influence of four empty container repositioning strategies (including "resource not sharing strategy, shipping capacity sharing strategy, empty container sharing strategy, and simultaneous sharing of shipping capacity and empty container strategy"), empty container repositioning time window and the change of economic parameters on the total cost of empty container repositioning was studied. Compared with the resource not sharing strategy, the total cost of empty container repositioning under the shipping capacity sharing strategy, empty container sharing strategy, and simultaneous sharing of shipping capacity and empty container strategy were reduced by 4.90%, 2.11% and 6.28%, respectively. In concision, by strengthening the tightness degree in cooperative empty container repositioning between shipping companies, both the total cost of empty container repositioning and the influence of increasing cost rate in holding and leasing empty containers on the total cost of empty container repositioning can be weakened, and the influence of empty container repositioning time window on the total cost of empty container repositioning can also be lessened; nevertheless, the increase of cost rate in repositioning empty container and freight royalty factor may decrease the superiority in the tightness degree of cooperative empty container repositioning.