Swimming requires a high level of physical quality and strength of athletes. As a typical water sports project, core strength training is particularly important in project training. In the process of training, some coaches do not grasp the key points of core strength training in place, so the training guidance effect is not ideal. To change this situation, we need to continue to study the core strength training methods of swimming events. This paper attempts to analyze the significance and methods of core strength training in swimming training, in order to improve the effect of core strength training in swimming.