Qingdao, as a city with a colonial history, has numerous architectures that combine traditional Chinese architectural style and Western architectural style. One of the most distinctive types of architecture is the church. Churches have significant mental support functions as well as their function as shelters. They are symbols of the city, and valuable for the city to present its architectural scene. This article wishes to state the backgrounds and history of Catholicism and Protestantism; compare the differences in external spaces, internal spaces, decorations, and volume of Qingdao catholic church and Qingdao Christian church to analyze the architectural differences based on different religious backgrounds; emphasize the characteristics and connotations for churches. Studying church architecture can reveal the creativity and technical proficiency of ancient architects and craftsmen. Church architecture encompasses knowledge and skills from various fields, including structural engineering, sculpture, painting, and decoration. Such research contributes to the advancement of architectural design and engineering technology. Church architecture is a reflection of human creativity and cultural traditions, and it holds significant importance for the study and preservation of cultural heritage.