The good contact between the catenary and the pantograph in the electrified railway is the precondition for the safe and reliable operation of the train.The contact of the pantograph is the frictional contact under the currentcarrying conditions.Therefore

it is necessary to conduct in-depth research on the frictional contact.In this paper

sliding electric contact testing machine is used to study the sliding electric contact friction force of bow nets under different working conditions（pressure fluctuation amplitude

pressure fluctuation frequency

contact current

sliding speed）.The results show that the sliding friction between the pantographs decreases with the increase of the contact current on the slide;When the pressure fluctuation amplitude and sliding velocity increase

the friction between the pantographs also increases.The pressure fluctuation frequency has little effect on the pantograph friction force.By using the basic idea of curve estimation

a single factor mathematical model that best expresses the influence of pressure fluctuation amplitude

contact current

and sliding speed on the sliding friction between pantographs is presented;On this basis

the multi-regression method is used to establish the model of the bow-net friction under the action of pressure fluctuation load and current and verify the validity of the model.