The Western Kai Church is the largest Romanesque church building in North China with a building area of 1891.95 square meters and can accommodate up to 1,500 people. The building's plane is in Latin “Ten” shape, and the three giant domes up to 45 meters are arranged in a “pin” shape. The three domes are slightly elongated, the surface is covered with green copper, and the giant dome is supported by wooden structure. There is a bronze cross on each dome. Since the bishop refused to install a lightning rod in the dome at the time, a cross was thundered in the 1950s and a lightning rod was added later. After the 1980s, the surrounding high-rise buildings were stacked and the church was not the tallest building, so lightning rods were unnecessary. The main part of the outer wall of the building of the Western Kai Church is made of red and yellow tiles, and the veneer is used as a decorative belt. The building's façade is characterized by a semi-circular arched window composed of round windows and column-shaped vouchers. There are many murals and large organ in the church. There are holy water altars in the front yard. There are two gates on the left and right. Men and women enter from different gates, and towers are built around the entrance. The interior of the church building features French Romanesque architecture. The main hall is from the sides of the main entrance to the altar at the bottom. There are 14 pillars in the building, which are divided into two rows, each with 7 rows, forming a three-way corridor. The nave features a stacked composite colonnade that supports a semi-circular vault. The tall dome of the center is connected to the supporting arch frame by an octagonal drum base. The indoor octagonal dome and side windows are inlaid with stained glass. The interior wall painted murals are gorgeously decorated and full of religious mystery.
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西开教堂是华北地区最大的罗曼式教堂建筑，建筑面积1891.95平方米，可同时容纳1500人。建筑平面呈拉丁“十”字形构图，三个高达45米的巨型圆顶错落排列成“品”字形，三座穹窿顶均略向上拉长，表面以绿色铜板覆盖，巨型圆顶为木结构支撑，每座圆顶上有一个青铜十字架。由于当时主教拒绝在圆顶安装避雷针，20世纪50年代一个十字架被雷劈下，以后补装了避雷针。20世纪80年代以后，周围高楼叠起，教堂已经不是最高建筑，因此避雷针没有必要了。西开教堂的建筑外墙面主体是用红黄色花砖相间清水砌筑的，檐口下采用扶壁连列柱券做装饰带。建筑外立面以圆形窗和列柱券形窗组成的半圆形叠砌拱窗为要素，教堂内有许多壁画和大管风琴，前面院中有圣水坛，有左右两道大门，信徒分男女从不同的门入内，入口左右筑有塔楼。教堂建筑内部采用法国罗曼式建筑造型。正厅从正门两侧到底部的祭台，建筑内部共设有14根立柱支撑，分为两排，每排7根，形成三通廊式。中殿设有叠式复合方柱廊，支撑半圆形券顶。中央高大的穹窿顶，通过八角形鼓座与支撑拱架券廊柱相连。室内八角形的穹窿顶及侧窗均以彩色玻璃嵌作画。内墙彩绘壁画，装饰华丽，充满宗教神秘气息。