A new method of time-delay signature suppression in semiconductor lasers with optical feedback by utilizing Brillouin scattering effect in optical fibers is proposed. Experimental results show that, when a chaotic laser with an average power of 200 mW is injected into the single mode fiber with a length of 10 km and after the action of Brillouin backscattering in fibers, the peak value at time delay of 105 ns of the chaotic laser auto-correlation trace is reduced from 0.251 to 0.075 and the peak value at time delay of 105 ns of the chaotic laser mutual information trace is reduced from 0.087 to 0.008. On this basis, the influence of optical injection power on time-delay signature suppression effect is experimentally investigated and the results indicate that, when the average power of chaotic laser is within the range of 200-1500 mW, the time-delay signature can be effectively suppressed; when the number of measurements is within the range of 1-50, the time-delay signature suppression effect of chaotic laser by the fiber Brillouin scattering is relatively stable.