Abstract: North Troyes oilfield is located in the eastern margin of Caspian seashore basin, in which the wells have long flowing production stage, and optimal selection of choke size is of important significance for optimum production of the oilfield in this stage. The theory of gas-liquid two?phase choke flow is much more complicated than the single?phase choke flow, so empirical formula is generally used for the well flowing analysis. But the conventional empirical formula has big error in application due to the neglection of the water cut and the close correlation with fluid property and field conditions. In this paper, the new empirical model from actual production data regression is given. The comprehensive evaluation coefficient of the model is better than those from other empirical formulas, so this model is much closer to the oil?field production performance. Also, because the water cut influence is considered in the model, the well flowing choke design is more accordant with the development indices