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Firstly,we use the Time-Dependent Ginzburg–Landau (TDGL) mesoscopic model to simulate the phase transition process of macromolecule microsphere composite (MMC) hydrogel.We propose a free energy for such a reticular structure according to the structures of MMC hydrogel and entropy theory.This work generalizes the mean field theory confined by Flory–Huggins for free energy in a polymer blend system.A spectral method is adopted to numerically solve the MMC-TDGL equation.