The Western Kai Church is located on the Dushan Road, Binjiang Road, Heping District, Tianjin. It is located in the southwest and northeast. It is called the Catholic Church of Xikai. It is also called the Western Kai Church and the Old Western Kai Church. The Western Kai Church was built in 1916 AD by French missionary Du Paul. The building area is1891.95 square meters, can accommodate 1,500 people at the same time, and the plane is cross-shaped. The three domes are slightly elongated upward, the surface is covered with green copper plates, and the giant dome is supported by wooden structure. Each dome has a bronze cross. It is the largest Romanesque building in Tianjin and the cathedral of the Catholic Diocese of Tianjin.