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The evaporation on the ocean surface in tropical regions is discussed and it is found out that the vapor into the air through evaporation will change the surface pressure field, and that evaporation latent heat is composed of internal latent heat (vapor internal energy) and external latent heat (vapor pressure energy). The former becomes the atmosphere's heat energy directly and the latter applies work to the atmosphere immediately, which enhance the potential energy. The direct effects of large-scale condensation precipitation and cumulus convection condensation precipitation on the ambient pressure field and the geopotential height field are studied. Based on Kuo's method of cumulus convection parameterization, which embodied the effect of condensation internal latent heat on heat the atmosphere, it is suggested that the other effect should be added to reflect the variation of the surface pressure field as well as the upper geopotential height field resulted from the large-scale condensation precipitation and cumulus convection condensation precipitation. The continuity equation considering condensation is introduced so as being able to change the dynamical frame of the numerical forecast model with taking into account of condensation-precipitation in cumulus convection.