At present, the extent of the traditional line current protection is reduced by the complex distribution network structure; it is unable to realize the fast protection on the entire line. The article proposes a fast protection scheme of 10kV feeder line with the implementation of Distribution Automation (DA), based on the fiber optic communications, proposing the specific request to Feeder Terminal Unit (FTU) and protection logic. The simple and practical criterion is specified in the paper. It can realize the fault localization and fault isolation firstly, and then the master station will complete the repairing and resuming of the power transmission work. It is effective to solve the questions about the coordination between upper and lower layer protection, it can also enhance the power supply reliability.