In this paper, the flow field of mixer rotors of the wasted rubber reclaimed is firstly used with FEM software-ADINA. The field includes the pressure and velocity field, the shear velocity vetor and viscosity field. According to the results of the analysis, it discusses the advantages and disadvantages and applicability of the mechanical cross-linking solution of the waste rubber. And it shows the shearing tear ability of new 4-wing synchronous rotor is far more than it of ordinary 4-wing synchronous rotor. So the good flow scattered performance is.