Method and system for querying data

The invention discloses a method and system for querying data. The system comprises a proxy server and at least one proxy client side, wherein the proxy server is arranged at a server side serving as a data provider and used for providing the data issuing service for the proxy client sides, and the proxy client sides are arranged at a client side serving as a data user and used for obtaining and storing data from the proxy server and providing the data querying service. Correspondingly, the invention further discloses a data querying method. The structure is simple, the data upgrading is fast, the deployment cost is low, bandwidth resources are saved and the service performance is high.