Abstract: The emergence period of Conopomorpha sinensis in litchi was predicted by two forecasting methods, such as checking the eclosion rate day by day and classifying the pupa scales of the insect. By means of system research, the emergence period of C. sinensis was observed in litchi orchard, and the result showed that the emergence period of C. sinensis forecasted was same as in observe. It was suggested that the forecasting methods for emergence period in the paper could be applicated in practice.