With the survey on 214 knowledge-intensive service enterprises in China, this paper works on how the breadth and depth of the knowledge source and its balance affect the exploratory innovation performance, and how the dynamic capabilities play the role of mediation and moderation between the knowledge source strategy and exploratory innovation performance. The results show that improving the knowledge breadth and depth is beneficial to improving the exploratory innovation performance, broadening the breadth of the knowledge source is more conducive to improving the exploratory innovation performance than the depth of the knowledge source and the balance of knowledge breadth and depth has no significant effect on the promotion of exploratory innovation performance. In addition, this paper shows that sensory capability and conversion capability play partial mediation effects between the knowledge source strategy and the exploratory innovation performance, and capital capability can only positively moderate the improvement of the depth of the knowledge source to the exploratory innovation performance.