In order to study the generation mechanism and influencing factors of friction noise,a friction noise experiment was carried out on the pin and disc samples made of the materials which are the same as that used to make the crankshaft-flange of a rotary compressor using a pin-on-disc test machine.The finite element model of the pin-on-disc test machine was established by ABAQUS finite element software,and the main frequency of the friction noise of this friction system was predicted by the complex eigenvalue method and compared with the experiment results.The influence of relevant parameters on the stability of system and friction noise was discussed.The results show that the coupling of the normal and lateral vibrations of the pin and disc is an important factor causing self-excited vibration and friction noise.When the friction coefficient at the friction interface of the system exceeds the critical friction coefficient of the system,the system unstable vibration appears,and the larger the friction coefficient,the larger the occurrence propensity of the system unstable vibration and the friction noise are.The normal load has little effect on the unstable vibration of the system.Selecting a friction pair material with appropriate elastic modulus can suppress the generation of friction noise.