The invention is applicable to network technologies and provides a method for network resource management, a server and a client end, which includes: receiving, an error report from a client end, wherein the error report includes a data source of a data fragment that does not pass the validation of the client; obtaining, a category of the data source; shielding, the data source when the data source belongs to a first category; and instructing, the data source to update network resources to which the data fragment belongs, when the data source belongs to a second category. The invention avoids the situation that the client end is unable to download a complete file due to an error of an original source of network resources, and improves the success rate of downloading.