In quantum information,single photon is usually used to transmit information.Therefore, single-photon detection technology has become a focus recently.At present,the single photon detector (SPD) based on InGaAs/InP avalanche photodiode (APD) has low working frequency,and the freq uency of the SPD can not be adjusted continuously.When APD works in a high speed gated mode,the photo-gen erated avalanche signal is buried in the spike noise due to the capacitive response of APD,which leads to a relatively low detection efficiency.In order to reduce the afterpulse probability and en hance the operating frequency of the detector,we design the quench-reset circuit for InGaAs/InP APD based on high- speed sine wave gating.To overcome the strong background noise and improve the detection efficiency,we ex tract the effective avalanche signal using double-APD balancing.Experimental results show that the working fr equency of the detector can be adjusted continuously.At the temperature of －50℃ and with gating frequency ra nge of 1～1.3GHz,the highest detection efficiency reaches 35%,dark count probability per gate is 4.2×10 －5.When the detection efficiency is 18%,dark count probability per gate is 5.6×10－6.In both cases,afterpulse probability per nanosecond is less than 5×10－6.