The invention relates to a method for wide band single carrier system resource allocation messages which comprises that: the sending end computes a parameter M according to a resource allocation message and sends M=An+Pn+O-N-1 through a control signaling; N is the total number of resource blocks, O is an initial block; Pn is the quantity of continuously allocated resource blocks and is an element of a P set of the resource blocks which are allowed to be continuously allocated; the An is equal to n x (N+1)-(P1+P2+...+Pn); the receiving end receives a reduction parameter M of the control signaling and begins to an interactive computation of Aj= Aj-1+N+1-Pj since j is equal to 1, wherein, A0 is equal to 0, until the Aj-1 is less than M+1 which is less than or equal to the Aj, n is equal to the j, the Pn is equal to the Pj, the O is equal to M-An+N-Pn+1. The method takes advantage of the single parameter M to replace the duo-binary digital combination to transfer the resource allocation message based on decreasing the complexity of the DET precoder to ensure that the quantity of the continuously allocated subcarreiers meets the requirement of only containing factors (2,3) or factors (2,3, 5), has the advantages of effectively decreasing the complexity of the DEF precoder, simple and easy encoding/decoding rules and lower signaling cost.