The evolution and interaction of picosecond dark pulses with finite-width were discussed by solving the nonlinear Schrdinger equation with variable coefficients numerically. The results show that, periodic regeneration effect of dark solitons stably exists in the distributed system. And periodic regeneration of dark solitons is not influenced by the interaction. Further simulations indicate that this effect is less sensitive to both loss and finite perturbations, such as white noise. This reveals that this periodic regeneration effect is stable.