An efficient single-photon detector was realized using high-speed diode to eliminate the spike of InGaAs/InP avalanche photodiode (APD). The repetition rate of the single-photon detector reached up to 700 MHz. With the APD operating at the temperature of 218 K and the detection efficiency of 10%, we demonstrated that the typical dark-count and after-pulse probability was 7×10-6/pulse and 74%, respectively. This scheme provides a simple and robust method to realize high-speed single-photon detection.