With the continuous accumulation of data, the data storage system has evolved from a single-node, small-scale file system to a distributed file system that supports massive data storage. How to provide simple, efficient and stable data uploading and downloading service for users has become an extensive research problem in distributed file system. To this end, we propose a server-side solution based on FTP protocol, which includes the use of buffer, coroutine, multi-process, and other technologies to improve the algorithms and optimize the transmission model, so that the data flow can be transferred rapidly. The proposed solution achieves high availability, high concurrency, and good scalability with the cooperation of Keepalived and LVS. Modifications to the FTP protocol makes the server support dynamic validation and compatible with multiple encoding formats. In the actual operation, taking storage system of China Science and Technology Cloud, i.e. iHarbor, as an example, the effectiveness, reliability, and performance of data transmission of the proposed solution are verified, which can fully meet the needs of users.