A method for information transmission is disclosed, includes: at the sender of a radio communication system, processing the information that needs to be periodically sent and the information that need not be periodically sent, respectively, reassembling the information into data units, setting sequence numbers for the reassembled data units with spaces of sequence number independent from each other, respectively, and sending the data units via different logical channels, respectively; at the receiver of the radio communication system, processing the received information that needs to be periodically sent and information that need not be periodically sent, respectively. Another method for information transmission is disclosed as well such that, if the information of an SDU that needs to be processed with higher priority is received during information transmission, the processing of the information of the current SDU could be interrupted and the information of the SDU that needs to be processed with higher priority could be processed with higher priority. The invention simplifies the processing of information transmission, raises the efficiency of transmission, and reduces the error rate and cost, thus implementing the scheduling of different types of information, and improving the reliability and flexibility of information transmission as well as the overall system performance.