Strategic choice is the key link in strategic management, and successful strategic choice depends greatly on appropriate strategic evaluation. In this paper, the authors develop an evaluating technique which is convenient for corporate to make strategic choice. On the basis of discussing the existing techniques for environmental scanning, the authors introduce an environmental scanning matrix on the background of a diversified corporate YY, and then use it to empirically examine the environmental information for the corporate. After that,the authors develop a strategic leverage system that integrates various theories on strategic choice,then apply approach of AHP to evaluate the business units in Corporate YY. Finally,on analyzing each of the evaluation results,the authors put forward the corresponding countermeasure for strategic choice in Corporate YY. Moreover, the authors discuss the main shortcomings in this research and propose further research direction.