The invention discloses a method for analyzing and evaluating decision supporting capability evaluation of a complex system, comprising the following steps of: establishing a system capability requirement model, generating a decision network model, establishing a decision supporting capability evaluation model and evaluating the networking decision supporting capability. In the invention, the method breaks through the conventional evaluation method only based on an index system, and comprehensively utilizes theory methods, such as comentropy, architecture and the like, so that the analysis is more scientific and the pertinence is more obvious, thereby the method can be used for guiding the design of the system structure of military electronics information system and organization operation of the system in fighting.