Abstract: The main methods of measuring the secondary electron emission coefficient in MgO films,including electrostatic method,pulsed neutralization method,double electron gun method,thermal control method,monopoles’ method and indirect method in PDP are summarized.The principles of the methods and their advantages and disadvantages are expatiated respectively.Working conditions in methods of measuring are suggested.According to the analysis,pulsed neutralization method and double electron gun method are preferable.