In this paper, basic ionic liquid [NH-(C2H4OH)3]+ is synthesized. The effects of cooking temperature and time on pulping process are analyzed based on the changes of lignin quality. Kinetics experiments are carried out under the temperature 80℃, 90℃, 100℃, 110℃, 120℃, respectively. The results indicate that delignification reaction kinetics of basic ionic liquid [NH-(C2H4OH)3]+ cooking rice straw pulping process belongs to first order. The linear regression equation is lnk=10.327-6174.2/T, and its fitting coefficient R2=0.9901. Delignification reaction activation energy is 51.344kJ·mol-1.