Considering the characteristics and machi ning difficulties of integral components circumferential blade， the design of ca thode with a insulated cavity ｉs carried out. Two three dimensional models of t he flow field ａre built， ａｎｄ the finite element method ｉs applied ｔｏ the flow fiel d simulation. Analysｅs of the results show that the inlet of electrolyte from the side of blade basin and back with an optimized outlet ｉs better， flow rate is higher and the uniformity of flow field is better. The experiment ｉs carried out based on the cathode which is designed by simulation results． Ｅxperime n tal results show that the simulation results ａre accurate， the process is st eady and the machining efficiency is higher.