The performances and constructions of four PSJA with different orifices are presented. Based on RANS, the flow field distributions of the four kinds of PSJA are discussed. Data of PSJA with different orifice constructions are compared. Cone orifice has the best effect of the four kinds of constructions for its outflow concentrated strongly with less diffusion. On the opposite, the round orifice with great diffusion can't form continuous flow. As for the PSJA with straight and the cone straight orifices have the same velocity distribution shape of the jet.