This paper has introduced a fast GEO satellite conceptual design method named Statistical Design Model (SDM). The main merit of SDM is to determine parameters involved in the satellite conceptual design phase, such as power and mass, with an acceptable accuracy and time performance. This method implemented by means of a complete database can readily find specifications of GEO communication satellite subsystems. With respect to the application of GEO communications satellites as well as high cost and time required for their conceptual design, a demand has always existed to shorten the duration of the development of such satellites. Herein, we present SDM method for the conceptual design of GEO communications satellites lying in the mass range of 1000 to 7000 kg and amply indicate its effectiveness for reduction of design time. For implementation of SDM and the attaining of reliable relations, we used a database which is constructed from records of over 450 GEO communication satellites launched between years 2000 and 2016. The attained relations demonstrating the subsystems specifications are analyzed. The accuracy of the proposed algorithm is verified through a case study and also through a statistical method. In the various subsystems, mean error of the obtained results was nearly 15.7%, being well acceptable for the conceptual design phase.