This paper addresses the problem of multi-UUV along given spatial paths with a given forward speed profile while holding a desired formation pattern in three-dimensional space. The decentralized controller is proposed to realize the coordinated path tracking of multi-UUV. In the path tracking control problem of a single UUV, we introduce line of sight navigation algorithm to design path tracking controller, making the tracking error converges to zero asymptotically; introduce graph theory to design coordination controller, making the multi-UUV reach consensus under the provisions formation along the position of desired path and speed, reaching coordination between multi-UUV, without affecting the path tracking performance in spatial domain.