The invention relates to a method for distributing point calling channel and group calling channel simultaneously in voice group calling service, suitable for GSM-R system. 3GPP protocol standard (TS 03.68) has no clear define to channel distribution in A interface voice group calling service, only introduces the process of first to distribute point calling channel, then to distribute group calling channel in the group calling establishing flow. The invention discloses a new voice group calling channel distributing scheme, saves the group calling establishing time of about 500ms by distributing point calling channel and group calling channel simultaneously, and causes the voice group calling service more suitable for railway which is a special application environment with high reliability and time delay requirement.