The invention, relates to the wireless communication field, provides a channel distribution method, an apparatus and a system thereof. A problem of low channel data transmission efficiency caused by inflexibility carrier frequency distribution can be solved. The method comprises the following steps: receiving a channel resource application transmitted by a mobile terminal and acquiring wireless signal quality information of at least one carrier frequency which covers a position of the mobile terminal; selecting one carrier frequency to provide a downlink channel resource for the mobile terminal according to the wireless signal quality information of the at least one carrier frequency; sending a notification message to the mobile terminal, wherein the notification message carries a selected carrier frequency number. The method, the apparatus and the system provided in the invention are suitable for a global system for mobile communication (GSM).