We propose and numerically demonstrate that the feedback induced time-delay signature in an external cavity semiconductor laser can be eliminated by randomly modulating feedback phase. We find that when the rate of the random modulation signal is within the range of 0.1—1 Gb/s, and the number of the random variation amplitudes reaches 5, the time-delay signature corresponding to the external cavity can be effectively suppressed in the parameter space of injection current (1.2—2.8Ith) and feedback rate (8—26 GHz).