In the present paper, we deal with the degenerate parabolic system of porous medium type with non-linear diffusion m and interaction q in IRN in the critical case of (Formula Presented.). We establish the ε -regularity theorem for weak solutions. As an application, the structure of asymptotics of blow-up solution is clarified. In particular, we show that the solution behaves like the δ-function at the blow-up points. Moreover, we prove that the number of blow-up points is finite, which can be controlled in terms of the mass of initial data. We also give a sharp constant for the ε -regularity theorem.
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