Abstract: The technological process of brake materials for the rotating wings of z-8 helicopter was studied in the research,Frictional properties of nonmetal-base, coper-bake and iron-base brake materials were compared under same test conditions. The effects of lubricating components, MoS_2 and BN, and frictional materials of iron-base were discussed,The mechanism of this effects was also explained. The amount of nonmetal components may control the peak ratio of moment of frictional force in the braking process by friction materials. It may also increase the stability of moment.The iron-base materials with fine lamellar pearlite structure showed the best frictional properties. A "9-9 iron-base material" was successfully manufactured and firstly used in brake system of z-8 helicopter.