The corona poling characteristics of the electro-optic polymer (chromophore DR19-doped PMMA) have been studied experimentally. The poling effects by poling parameters (voltage, temperature and time) on corona poling process have been analyzed by UV-Vis absorption spectroscopy and microscope. The electric fields inside the films increase with poling voltage, but the electric breakdown may occur with too high poling voltage. The chromophore orientation energy increases with poling temperature, but the phase separation may occur when the temperature higher than the vitrification temperature of polymer. The chormophere orientation increases with increasing poling time and reaches the dynamic balance at last. With increasing poling voltage, the order parameter which represents the poling effects increases to a maximum and then drops. Also the same trend of the order parameter has been obtained with increasing poling temperature. While the order parameter increases and reaches saturation with increasing poling time.