Abstract: The friction properties and heat resistances of iron-copper-based powder metallurgy friction materials were tested under two different surface pressures and seven continuous braking conditions by using MM3000 friction and wear testing machine, the wear mechanism of friction materials at two different speeds was studied by SEM and EDS. The results showed that at a line speed of 19.40 m?s-1, the coefficient of dynamic friction of the friction material decreases slightly with the increasing of surface pressure, which is 0.267-0.312 at 0.44 MPa and 0.258-0.308 at 0.80 MPa. The kinetic friction coefficient fluctuates more under the first continuous braking condition（Linear velocity 19.40 m?s-1, surface pressure 0.44 MPa, braking energy per unit area 268 J?cm-2）; under other conditions, the kinetic friction coefficient fluctuates less. With the increasing of braking energy, mean kinetic friction coefficient under seven continuous braking conditions varied from 0.300 to 0.334, and the kinetic friction coefficient was above 0.25 without apparent decline, indicating that the iron-copper based powder metallurgy friction materials have better heat resistance. Under 19.40 m?s-1 working condition, the frictional wear mechanism of iron-copper based friction materials is mainly abrasive wear and oxidation wear; under 30.00 m?s-1 working condition, the frictional wear mechanism of iron-copper based friction materials is mainly fatigue wear and oxidation wear.