Objective criterion for the preparation process of W-Cu green sheet by powder rolling was investigated, and an objective methodology frame for the preparation was obtained. Based on the change tendency of mixed behavior, the optimum ratio between powder and adhesive was obtained. Based on differential thermal and thermo-gravimetric analysis results, the drying temperature and drying time of powder was determined. Based on the law of conservation of mass, the density of the powder-rolled green sheet was determined. According to materials’ own physical and chemical property index, the effect of human elements can be weakened, and thus the stability of preparation process of green sheet by powder rolling can be increased.