Abstract: The effects of cumulus heating on the land and sea breezes are studied with the use of parameterization theory.It follows from the linear theory that wind field is changed greatly by cumulus heating with a constant eddy coefficient and a constant static stability.Cumulus heating can also modify the static stability.The results of the nonlinear model show that the most important effect of cumulus heating is to strengthen the vertical motion.The sea breeze is one of factors of developing thunderstorms.This mechanism can be clearly visible if the effect of cumulus heating is considered.In comparison with each other,the results of two models have some similarities.