In this paper,the existing linear forwarding time delay allocation methods are analyzed,and then a non-linear forwarding time delay allocation method is proposed for cooperative ultra-wideband system.Theoretical analysis verifies that the minimum conflict probability can be obtained using the proposed method with equal probability.Numerical results show that compared with traditional linear time delay allocation methods,the proposed method can reduce the conflict probability of forwarding signals efficiently,and the performance gain of the cooperative ultra-wideband systems can be obtained.