In order to provide technical parameters choosing refference to performance as well as size amd weight computations of turboshaft engines, the technical parameters of ten typical types of foreign turboshaft engines were collected. Then, the models and corresponding programs for performance calculations and evaluations of size and weight of turboshaft engines were set up. The technical parameters were collected of ten foreign typical turboshaft engines from 1 to 4 generations, which were evaluated with the programs metioned above so that the level and developing trends of these parameters were obtained. Then, the technical parameters were evaluated of the advanced turboshaft engine of next generation. Based on the developing trends of the technical parameters, it was studied what the main dynamic, structural and strength parameters would affect the turboshaft engine performances, which helped to provide evidences of turboshaft engine integration design.