InGaAs/InP single-photon detector is an important device in quantum key distribution system. In order to make it come true on the nationalization of InGaAs/InP single-photon detector,a kind of InGaAs/InP single-photon detector based on domestic components,including avalanche diode,single-chip microcomputer module,temperature control module,bias voltage module,gating signal module and small signal processing module,is developed in this paper and the program has been written. The experiment proves that the maximum detecting efficiency of the detector is about 25 % on the condition of 100 MHz gate control and -45 ℃ cooling temperature. When the detecting efficiency is 10 %,the dark count rate is about 5.8×10-6/ns and the pulse rate will only reach 1 %. The single-photon detector introduced in this paper can meet the requirements of domestic instrument and equipment. It has great value to the security of information data in the key field of China.