The invention discloses a network performance improving method oriented to multi-cloud architecture and belongs to the field of cloud computing. The method solves a problem of a conventional multi-cloud architecture system does not pay attention to performance difference of different cloud storage servers in order to improve network performance. The network performance improving method uses the multi-cloud architecture. A user file is stored redundantly in multiple cloud storage servers after being encoded by erasure codes. Each cloud storage server may just obtain a part of the data of the user file. The cloud storage server with good performance can be used as much as possible according to an actual network environment when file transmission is performed and the file transmission is prevented from being encumbered by the cloud storage server with poor performance. Thus, the network performance of a system is better than the conventional multi-cloud architecture system and any cloud storage server. While guaranteeing the high reliability, high security, and low operator locking risk of the multi-cloud architecture system, the method may dynamically adapt to the network performance of different cloud storage servers and greatly improves the network performance of the system.