All-optical regeneration is the core technology in all-optical communication in the future in which the key technique is the all-optical clock recovery. Based on the carrier rate equation and the coupled wave equations the mechanism of all-optical coherent clock recovery using two-section distributed feedback Bragg (DFB) lasers' self-pulsation is studied. Numerically simulation method is used to analyze the lockup, walk-off and phase stability in the clock-recovery process. The results indicate that the fast lockup and walk-off of the clock-recovery process are about 1 ns and on the order of subnanosecond respectively. The bit-rate detuning, bit-rate and the injection power all have influence on the phase stability. The analysis shows that the stability of self-pulsation can be enhanced by optimizing the parameters and external conditions and supply optimized designs for the research and facture of all-optical signal regeneration devices.