We take AC-13, SMA-13 mixtures as the research object,and describe the method of generating particles which is based on the theory of discrete element method. We judge whether the result of generating two mixture particles is consistent with the reality, results show that:two kinds of mixtures are suspended dense type and skeleton dense type, and agree with the actual situation; analysis properties of two kinds mixed material based on splitting test to verify the the feasibility of discrete element method, and a new train of thought is proposed for the research of the mixture properties in the future.