Abstract: The photocuring processes of acrylic acid and acrylate were monitored by mea-suring the variation in double bond content with IR spectrometry.The initiating efficiency ofdifferent photomitiators and various factors affecting the photocuring reaction were examined.It was obviously found that the efficiency of a, a-dimethoxy-a-phenylacetophenone(IR651)and a-hydroxy-a,a-pentamethylene-acetophenone (IR 184) is higher than that ofbenzoin ethyl ether(BE),and that the speed of the photocuring reaction and the final conversion of coatings can be increased with raising temperature and incident light intensity as wellas using inert(N_2)atomosphere.