The embodiment of the invention discloses a business processing method and a client, which are used for improving the security of a shared file. The method disclosed by the embodiment of the invention comprises the steps that a first client receives a request sent by a second client, wherein the request is a request of the second client for obtaining the shared file of the first client; the first client provides a sharing service for the second client according to the request, thus allowing the second client to obtain the shared file; and when a preset sharing termination condition is satisfied, the first client stops the sharing service. The embodiment of the invention further provides a client. By adopting the embodiment of the invention, the security of the shared file can be improved.