The invention discloses a distribution method of channelization code in code division multiple access system, which including: A. the spread spectrum codes distributed to every sector and the correlated coefficients between the spread spectrum codes distributed to every neighboring sector are calculated according to the cellular codes and the channelization codes distributed to every sector, when the network is programmed; B. every sector is divided into different regions and the edge region of every sector is formed; C. the priority of which every channelization code is at the edge region of every sector is decided according to the correlated coefficients between the spread spectrum codes distributed to every neighboring sector; D. the position information of user is real-time calculated during the operation of system, and which region the user positioned in sector is determined according to the position information; E. according to the region at which the user positioned and the decided priority of which every channelization code is at the edge region of every sector, distribute the channelization codes to every user. The method of the invention can reduce the same-frequency interference of the edge region of sector due to the correlation of the spread spectrum codes, so as to improve the communication quality of which the users are at the edge regions of the sectors.