An mixed active-passive quenching circuit, which can quench the avalanche current and shorten the bias voltage recovery time quickly, was designed. A SPICE model was established for single photon avalanche diode detector (SPAD), and the accuracy and practicability of the model was verified by using passive quenching circuit. Then parameter adjustment and functional verfication of the designed circuit were carried out by combining SPICE model and computer simulation technology. Simulation results show that the quenching time and recovery time of the circuit reaches 150 and 400ps, respectively, which can meet the requirement of single photon laser ranging.