The characteristics of the conjugate wave in Brillouin-enhanced four-wave mixing (BEFWM) with large incident signal are investigated experimentally. It is demonstrated that under the condition of large signal and deep interaction, temporal stability and correlation between the input and output pulse shapes are better than that of BEFWM with small signals, and modulation phenomena will no longer appear in this case. At the same time, the conjugation fidelity is almost 100% and constant with different signal intensities. With enlargement of the signal intensity, energy transform efficiency of BEFWM increases.