As for the study of particle reinforced compound material, researches are mostly made on its module of elasticity, This article deals with particles of the same size in their states of compactness. The authors have estab(?)hed the modular form of connected points and deduced the rule of change in the strongth of material which Js mixed with foreign paticles. It has been found, on the basis of the particular shape of the curve, that the strength comparison rate F=R/R_(A_A) varies with the mixing rate P=A/B which can with the help of the N(0.1)curve of Gaussian distribution to obtain the strength comparison rate F(P).