This paper studies the threads load distribution of grease feeding valve’s with a simplified analytical model, named thread spring model, 4 grease feeding valves with different thread structure were investigated based on this model for obtaining load distribution. The factors, such as the stepped plane position of Stephole in feeding valve passage, the annular groove position and width, the axial groove width and geometric profile, the engaging length of threaded connection and the rod diameter, were study for obtaining the affecting law on the thread load distribution.