In the cruel competitive environment of heavy duty automobile market, how to objectively analyze the requirements of power configuration and the optimal configuration is a final goal for car companies. This paper Based on the view of strong related with speed and the working condition of vehicle, this paper propose a novel analysis and decision method. First, we pre-process the sample form the vehicle terminal system and utilize the artificial neural network SOM to cluster velocity distribution. Next, the typical automobile condition is summarized from typical working conditions of all kinds of models. Finally, we explore the demands of conditions and power configuration for each type automobile based on typical automobile condition and automobile specific configuration. A numerical demand analysis reduces the quality complaints and eliminates ambiguity for car companies in the research, development, production and sales, which indicates that the scheme has important practical value in practice.