The invention relates to a method for creating frequency domain zero correlation area code and the device and multi-carrier CDMA system. In the embodiment, Kronecker product operation is performed by initiation sequence and Walsh sequence generated according to the system parameter to acquire frequency domain zero correlation area code; the system adopts the frequency domain zero correlation area code for data transmission and user identification, which can effectively avoid interference between users due to selective fading of channel frequency, and support more users compared to system of existing frequency domain zero correlation area code and its selection scheme and support multi-speed service , and does not need code reallocation when active user number changes.