Abstract: The paper details the calculation method of single sine phonological model(SSPM) in insect phenology,in which the daily temperature is curved by sine function.Accumulations and daily degree-days are acquired by integral equation methods.Two parameters,low temperature threshold and upper temperature threshold,and two input values,daily minimum and maximum temperature are applied in degree-days calculation.There were six equations under combination of those parameters.Taking cotton bollworm(Helicoverpa armigera) for instance,the calculation and prediction process of SSPM are clarified in insect phenology.With the development of the Internet and automation weather station,SSPM have more prospective application in regional pest management.

Key words: tillage, weed, biodiversity, competition, oat yield.