The invention discloses a method of sending and receiving business, the method of sending business is: separate the radio link control (RLC) block data buffer area in send window into no less than twosub-area, and set up transmit mechanism for every sub-area, in every sub-area the transmit leg send the RLC block data according to the set transmit mechanism; the method of receiving business is: separate the radio link control (RLC) block data buffer area in receive window into no less than two sub-area, and set up receiving mechanism for every sub-area, in every sub-area the receiver accept the RLC block data according to the set receiving mechanism. The method provided by this invention can meet the different quality of service requirements of different businesses, reduce business time delay, and reduce waste of wireless resources.