For the seepage law research of fluid in a mixed broken rock mass, a broken rock penetration test system composed of a hydraulic pump, a permeameter and a DDL 600 electronic universal testing machine was used to test mix broken rock permeability properties, and the difference infiltration characteristics were analyzed between a mixed broken rock sample and a single sample. Research shows that the non Darcy flow characteristics of Mixed broken rock sample is more obvious than single broken rock sample, with the increase of porosity, variations in the permeability of single samples are bigger than mixed samples, and the same particle size of different lithology rock permeability variation degree and the change trend appear bigger difference, with the increase of porosity, mixed sample of non Darcy β flow factor show decreasing trend, and on the basis of different particle size, the mixed sample of non Darcy β flow factor is not necessarily greater than the single sample.