Abstract: By using a 2-dimensional axial symmetrical PEM,in which the Ekmau pumping and the cumulus momentum transport are included,the influences of the condensational heating profile on the development of the typhoon depression have been investigated in this paper. The results of numerical simulation show that ths circulation of the modeling typhoon develops faster in the lower troposphere if there is stronger heating in the middle-lower troposphere; the structure of the modling typhoon is more similar to real typhoon when the stronger heating is in upper troposphere.In the process of typhoon depression development,the profile of convective condensation heating will be changed. The maximum heating may develop and transport from middle-lower troposphere to middle-upper troposphere. Thus,typhoon depression can not only develop fast and the structure is also similar to real typhoon. This process may be a general process of the tropical depression developing into typhoon.