A constant current diode voltage pulse circuit structure of single arm suspension bridge driver was designed. Firstly introduced the circuit structure and working principle of suspension pulse driving module, the constant current diode characteristics of constant current module and the partial pressure calculation method of constant current diode in series. Then applied the principle to design the testing circuit, and used the circuit in half bridge topology switching power supply. The test result indicated that the driver performance fully met with design requirements, and it was worth spreading.