Abstract: Through the control of ball milling time, the influence of ball milling time on the particle size distribution and powder morphology of fine copper powder was investigated, and the suitable ball milling time parameters were determined. The results show that before the ball milling time is 20 h, the particle size distribution index of copper powder continues to decrease with the increase of ball milling time, and the agglomeration of copper powder is not obvious. After that, with the increase of ball milling time, the agglomeration of ball milled copper powder was obvious, and the uniformity of ball milled copper powder decreased. Comprehensive analysis, when the ball milling time is set to 20 h, the particle size distribution, phase analysis and appearance of the ball milled copper powder are the best. At this time, the uniformity of the ball milled copper powder is improved, the surface of the powder is relatively flat, the diameter distance Dδ reaches the minimum value of 1.723, the specific surface area is 0.796 m2.g-1, and the median diameter D ( 0.50 ) is 9.97 μm.