Abstract: To increase further the accuracy of flow regime and considering the non-stationary charac-teristics of differential pressure fluctuation signals of gas-liquid two-phase flow,the flow regime identifica-tion method based on recurrence quantification analysis（RQA） and multi-sensor data fusion techniques is put forward.First of all,the recurrence quantification analysis method is used to extract the nonlinear feature pa-rameters of the differential pressure fluctuation signals of gas-liquid two-phase flow,and data fusion of fea-ture layer is conducted by QRA feature parameters of differential pressure signals of three pressure measure intervals,and composes the fusion feature vectors.The fused characteristic vector are input into the support vector machine for identify flow regime.The identification results for four typical flow regimes of air-water two-phase flow in horizontal pipe has shown that the reliability of the identification result is improved evi-dently.