Abstract: Since the direct sequence spread spectrum is usually submerged in noise, in order to effectively recognize the direct spread sequence signal, the frequency hopping spread spectrum and the conventional modulated signals, an identification algorithm based on instantaneous characteristics and high-order cumulants is proposed. Firstly, the normalized fourth-order cumulant slice parameters of FM、MFSK、MPSK、DSSS and FHSS are verified the same, and the general expressions of for AM and MQAM are deduced. Secondly, is used to detect the communication signals in the noise. And then the occupied bandwidth characteristic parameter is used to divide the signal into two types: spread spectrum signals and conventional modulation communication signals. Finally, the parameters of instantaneous characteristic and high-order cumulants characteristics are utilized, which identify the spread spectrum signals and the five conventional modulated communication signals, respectively. The simulation results show that when the signal-to-noise ratio is higher than 1dB, the correct recognition rate of the above seven kinds of signals can reach 100%.