A conclusion and analysis report were got from this article,in which indicated that the flowrate of the micro pore tube are mostly equal,pulse number is in negative correlation relationship tograin diameter under the same volume,the larger the grain diameter in standard sample,the morewidely it distributed through doing test on polystyrene microsphere standard material occupied differentgrain diameters.Besides,in this article,all the contents and parameters were given detailed analysisfrom the following two aspects: example and theory.Therefore,this article has provided reference forCoulter Multisizer 3particle-size analyzer user and researcher.