The invention relates to a dynamic adjustment method for the dimension of a data unit of a wireless link control protocol in a wideband code division multiple access system. The method comprises the following steps of: firstly configuring 1E/1F event measuring threshold on user terminal equipment and configuring a value of the maximum dimension of the data unit of the wireless link control protocol corresponding to the 1E/1F event; and then determining that whether the current value of the dimension of the data unit of the wireless link control protocol is modified by judging the types of theevents reported by the user terminal equipment and judging the current value of the dimension of the data unit of the wireless link control protocol. The invention adjusts the maximum value of the dimension of the data unit of the flexible wireless link control protocol according to the wireless channel quality, thus not only retaining the advantages of the dimension of the data unit of the flexible wireless link control protocol, but also avoiding the problem that the retransmission efficiency of data packet with large dimension is low under the condition of poor wireless environment and improving the system performance and the utilization ratio of code resources.