A policy decision method is provided, including receiving, by a policy and charging rules function (PCRF) device, a first user policy request for a first user sent by a gateway device, determining, by the PCRF device, that the first user and a second user share a usage quota, and the second user is an owner user of the usage quota, acquiring, by the PCRF device, a current second user counter status of a second user counter of the second user, and generating, by the PCRF device, a first user control policy according to the current second user counter status and sending the first user control policy to the gateway device. The present invention can implement sharing of accumulated data among users, reduces processing pressure of the charging system, and decreases a performance loss of the charging system.