In view of the defects of the prestage of the force feedback jet tube electrohydraulic servo valve, a new type of dividing valvecontrolled doublejet pipe electrohydraulic servo valve was proposed based on the split tip principle.A new structure of the servo valve with core elements of the doublecone valve core, splitter ring, doublejet pipe and straightrod type feedback spring rod was designed. The twostage control scheme of the new structure servo valve prestage and the main valve fluid flow control were determined, and the mathematical models of the prestage force motor magnetic circuit, the control valve core stage and the main valve core assembly of the new structure servo valve prestage were given. The results show that the output flow or pressure of the main valve is proportional to the input control current of the valve.