Abstract: Field observation of the stratified flows in West Lake was carried out in this study using a buoy-up ADCP meter method, and flow circulations in this lake were detected and confirmed for the first time. The flows were also simulated using an EFDC model and the in-situ measured data of wind field. The simulations were in good agreement with the layered velocity measurements of the flows, and it showed a good applicability of this model to the lake’s stratified flows. We analyzed and compared the characteristics of stratified flows under constant northeast wind and southwest wind across the lake measured in 2013, and found out that the flows in the lake, especially in its surface layer, were very sensitive to the wind field over it. A clockwise circulation was often formed at its southeast side under northeast wind, while an anticlockwise circulation at nearly the same location under southwest wind. Flow velocities in the lake varied from the order of 1 mm/s to 1 cm/s, uneven in distribution; higher velocities were around its inlet and outlet and near its bank while lower velocities in its central part.