The application techniques of the composites and the mass ratio of phosphorus-based smoke agent(HG94) to infrared interfering smoke agent(FY) in the composites were studied,and the smoke screen performances were tested. Under the conditions that the mass ratio of HG94 to FY in the composite is 2：1 and that of the composite to the explosive is 40：1,and the FY powder is charged above the HG94 cake,the composite possesses not only screening effects on visible lights but also interfering functions to laser,mid-IR and far-IR lights.