Cyrtorrhinus lividipennis is a vital predator of planthoppers in rice fields, The life table of experimental population of C. lividipennis, rearing on replacement prey Corcyra cephalonica eggs was improved. In laboratory, nymphal durations of C. lividipennis were calculated by means of a new method. The limitations of two kinds of life tables, time-specific life table and age-specific life table were analysed and resolved. The limitation of time-specific life table could be solved by adding the survival rate of immature stages.In age-specific life table, the durations of each stage and the whole generation could be calculated by a formulary detruded from the life table, and rmcould be got from the generation duration.The two kinds of life tables were improved and perfect, and became more convenient for use by these methods.