Abstract: The chaotic bubbling mechanism in the gas-liquid two-phase bubble column with a single orifice was studied using the deterministic chaos analysis technique.It was found that when the values of gas flow rate was low,the stages of period icity and quasiperiodicity could be clearly identified.And when increasing gas flow rate,the sequence led to chaotic behavior.The bubbling process had three different flow regimes with the increase of gas flow rate:periodic bubbling regime,chaotic bubbling regime and jetting bubbling regime.