The mechanical behaviors of granular materials presented by discrete element method （DEM）based on discrete particle model are closely relative to its numerical specimen. The generation techniques for granular materials specimens has attracted comprehensive attentions with development of DEM in numerical simulation of granular materials. The object of this paper is how to generate a more dense granular assembly using random sequential analysis (RSA) model. For uniform grains

that is to say how to generate more number of grains in given region. Four modified RSA methods are suggested and discussed; numerical practices show that the more dense granular assembly will be generated by sort of coordinates based on RSA.