A method implemented by a base station for positioning different mobile stations for a cluster system, characterized by comprising: activating, over a control channel, location information uploading functions of the mobile stations on which location tracking is to be performed; sending, over a location tracking data service channel, location information request messages to the mobile stations, wherein the location tracking data service channel is a service channel which has a same frequency as the control channel and a different time slot from the control channel, and wherein the location tracking data service channel is shared by the mobile stations by way of time division multiplexing at pull-up opportunities arranged by the base station, said pull-up opportunities being for transmitting location information of the mobile stations to the base station; and receiving, over the location tracking data service channel, location information reply messages sent by the mobile stations at the arranged pull-up opportunities respectively, wherein location information of the mobile station is carried in the location information reply message, wherein activating, over the control channel, the location information uploading functions of the mobile stations on which location tracking is to be performed comprises: sending, over the control channel, a positioning service activating request message to one of the mobile stations; and receiving, over the control channel, a positioning service activating response message sent by the one mobile station, and determining that the location information uploading function of the one mobile station is activated, and wherein information for indicating a time slot used by the location tracking data service channel is carried in the positioning service activating request message, and wherein said timeslot is used by the mobile station for sending the location information reply message. activating, over a control channel, location information uploading functions of the mobile stations on which location tracking is to be performed; sending, over a location tracking data service channel, location information request messages to the mobile stations, wherein the location tracking data service channel is a service channel which has a same frequency as the control channel and a different time slot from the control channel, and wherein the location tracking data service channel is shared by the mobile stations by way of time division multiplexing at pull-up opportunities arranged by the base station, said pull-up opportunities being for transmitting location information of the mobile stations to the base station; and receiving, over the location tracking data service channel, location information reply messages sent by the mobile stations at the arranged pull-up opportunities respectively, wherein location information of the mobile station is carried in the location information reply message, wherein activating, over the control channel, the location information uploading functions of the mobile stations on which location tracking is to be performed comprises: sending, over the control channel, a positioning service activating request message to one of the mobile stations; and receiving, over the control channel, a positioning service activating response message sent by the one mobile station, and determining that the location information uploading function of the one mobile station is activated, and wherein information for indicating a time slot used by the location tracking data service channel is carried in the positioning service activating request message, and wherein said timeslot is used by the mobile station for sending the location information reply message. sending, over the control channel, a positioning service activating request message to one of the mobile stations; and receiving, over the control channel, a positioning service activating response message sent by the one mobile station, and determining that the location information uploading function of the one mobile station is activated, and wherein information for indicating a time slot used by the location tracking data service channel is carried in the positioning service activating request message, and wherein said timeslot is used by the mobile station for sending the location information reply message.