The present work aims at studying the nonlinear behaviors of bubbles, including formation, interference, collision and coalescence, formed from a submerged orifice. The experimental data reveal that the departing periods of successive bubbles evolve regularly from single period to triple periods within the air flow rate regime of 100 cc/min < q < 2000 cc/min, due to the interactions between the consecutive bubbles. A new comprehensive theoretical model is developed for describing the instantaneous bubble behaviors during formation and ascendance processes and for predicting the departing periods and sizes of successive bubbles in constant flow rate condition. Owing to the estimation of instantaneous interactions between successive bubbles and the incorporation of the wake effect of previous bubble, the present model can elaborately describe the evolution process and mechanisms of bubble departing periods corresponding to different gas flow rate regimes. The theoretical results are in good agreement with the experimental investigation. Both the experimental data and the theoretical results state that bifurcation of bubble departing periods in constant flow rate condition is induced by bubble interactions.