Traditional methods for jamming effect evaluation in communication countermeasure cannot be applied to real-time evaluation in wartime.To solve the problem,an online evaluation method based on GA-ELM is proposed.Link-16 is taken as the research object.Firstly,the parameters of its anti-jamming behavior are analyzed and selected to build a sample library.Then,ELM is used to learn the sample parameters after classification,and the improved GA is used to optimize ELM,so that the GA-ELM model is obtained.Experimental results show that GA-ELM can obtain online evaluation results of jamming effect based on the parameters of anti-jamming behavior.The new method overcomes the shortcoming of the traditional methods, and is more close to actual combat.