Experiments were carried out to study gas-liquid two-phase flow through a horizontally mounted Venturi nozzle.The inner diameter of pipe is 25 mm and the throat diameter of Venturi nozzle is 5.1 mm.The pressure difference and pressure loss across the nozzle were measured.It was found that the degree of pressure fluctuation strongly depends on the gas quality.However,the relationship between the standard deviation of pressure difference and the gas quality is not monotonous.Multiple solutions may occur when the relationship was used to determine gas quality.On the other hand,the standard deviation of pressure loss was found to be monotonously correlated to X.This phenomenon was applied to measured gas quality.Also a modified Lin s equation is proposed to calculate the two-phase flow rate.The experimental measurements agree well with the predicted values.