Abstract: Polymethyl methacrylate (PMMA) is an indispensable important protective material in thetransfer process of graphene by PMMA assisted method. In order to analyze the effect of PMMA on the transfer quality of graphene, the surface morphology and photoelectric properties of graphene were systematically analyzed by Raman spectrometer, atomic force microscope (AFM), UV-Vis spectrophotometer, and Hall effect measurement system. Results show that the curing of PMMA plays an important role in the transfer quality of graphene, since fully cured PMMA can effectively support and protect graphene in order to reduce gravel damage, impurity adsorption and structural defects during the transfer process. In addition, the optimum curing temperature and time of PMMA solution were 180℃ and 120 s, respectively. The corresponding optical transmittance, carrier concentration and mobility of graphene achieved 90%, 6.7×10¹² cm^-2, 1 500 cm²/(V·s), respectively.