The invention relates to a paging optimization method and a paging optimization system, wherein the paging optimization method comprises the following steps: receiving a paging message which contains a user identifier of a paged user and is sent by a network side, wherein the paging message is a message sent to each cell of a tracking area of the paged user by the network side; judging whether the user identifier of the paged user exists in a pre-stored invalid paging list or not, wherein the invalid paging list records the user identifiers of the paged users of which a response time to the paging message of each cell exceeds a preset time; when the user identifier of the paged user exists in the invalid paging list, discarding the paging message corresponding to the paged user. According to the method and the system, by means of judging validity of the paging message which contains the user identifier of the paged user and is sent by the network side, the paging message corresponding to the paged user in the invalid paging list is discarded, time delay is reduced, and a success rate of paging is promoted.