Fuzzy interference was used to identify the parameters of Stribeck friction compensation model online and make it infinitely approximate to the real friction interruption in numerical value.A servo system friction compensation model was built up and simulation was made to verify the validity of the method.In addition a comparison was made to the tracking errors with and without friction compensation by using a highly accurate optical-electro tracking system and the friction compensation effect was further verified.Experiment result showed that:1) The wave aberration of zero passage basically disappeared and the tracking error was reduced to 20% of the original value;and 2) The low speed tracking performance was improved dramatically.