This paper puts forward a comprehensive choice and evaluation index system and a model based on principal componential analysis, and presents exact calculation and analysis with an example. The results prove the feasibility of the above-mentioned evaluation index system and the selection evaluation model,and the M&A targets are ranked through modeling. M&A activities of Chinese enterprises are in the development period, and the paper provides a viable comprehensive evaluation method for the buyer's enterprise to make decisions on selecting M&A target.