The research is mainly for the research of tungsten powder powder metallurgy molding process and the national 13th five-year construction needs. Using the MSC. Marc software, multi-scale simulation of the forming and high-pressure sintering of pure tungsten powder was carried out from the particle size, and the particle size, initial powder accumulation structure, pressing pressure, sintering temperature and other factors were systematically studied for the pure tungsten compact and sintering. The influence of the compactness of the blank, the size and distribution of internal stress, the rearrangement and deformation of particles, the mechanism of pore filling, and the densification behavior. In addition, physical experiments were used to measure the relative density curve, the internal structure of the compact and the internal morphology of the sintered compact during the compaction process, and the numerical simulation results were verified.