Method and system for synchronizing stock information

The invention discloses a method and a system for synchronizing stock information. The method comprises the following steps that: total stock information in a total stock module is divided into sub stock information corresponding to each sales module according to order information of each sales module, and the valid time is respectively set for the sub stock information of each sales module; order requests are handled according to the sub stock information of each sales module; the generated order information is sent to the total stock module; and the corresponding sub stock information is synchronized with the total stock module according to the valid time of the sub stock information. The total stock module receives the order information sent by each sales module, and updates the total stock information in the total stock module according to the order information. When the method and the system provided by the invention are applied, the problem that the stock information obtained by each sales module is possibly greater than the actual total stock in the total stock module can be solved.