There are many factors impacting on the cavitation intensity, such as the different combination of cavitation device structure shape and parameters, the different combination of hydraulic parameters and their mutual matching, etc. Based on the orthogonal experiment method, applies Fluent software to make numerical simulation on the choking cavitator of different structure parameters and dynamic parameters, builds orthogonal experiment evaluating index with the characteristics of void fraction and static pressure in choking cavitator under different parameters combination, and investigates the factors' influence on the cavitation intensity. The results indicate that the factors affecting cavitation intensity from big to small are flow rate Q, back pressure Pb, inlet angle , diameter d and length L of choking pipe. The optimal parameters for choking cavitation are Q of 2.0 m3/h , Pb of 70 kPa , of 35°, d and L of 10 mm and 50 mm.