Abstract: From the perspective of the evaluation on the contribution rate of weapon system of systems, this article summarizes the current research status and the technical difficulties in this research field. More specifically, the methods based on the combat loop, complex network, evidence reasoning, gray target theory, Bayes network, the structural equation model, exploratory analysis etc. are used to evaluate the contribution rate of weapon equipment system of systems. Furthermore, their advantages and disadvantages are compared and analyzed. Base on the comparisons, the method based on operation loops and complex networks which takes into consideration the relations between different weapons is able to assess the contribution of the weapon equipment in multiple dimensions. Hence, this method can provide more scientific and reasonable results to decision makers.