Based on the natural ventilation theory, the ventilation performance optimization of a new automatic wind catcher was proposed. Numerical simulation and experiment were carried out to study the relationship between the shape of exhaust grill and the wind pressure coefficient on its surface. In addition, the key parameters which enhanced the exhaust performance were proposed. The result has shown that the form with the best exhaust performance is the conical increaser. Compared with the wind catcher with no increaser, the exhaust rate of the conical increaser has improved by 14.3%. Furthermore, the wind catcher can achieve an air change rate of 8 times per hour in the typical weather of the winter in Beijing, which has a remarkable energy-saving effect.