Abstract:Wan Fulin Mansion is a very special mansion building in Shenyang. It is the only modern Fengxi Warlord mansion，whose architect nameless abandoned the traditional brick and wood mixed structure and the Westernesque Architecture style that were applied by other mansions in Shenyang. The mansion completely adopt modern architectural technology design such as reinforced concrete structure，and the Neo-French Classicism style with Art Nouveau that were rare in Shenyang during the first half of the 20th century. Based on the study of its site，function，style，structure and heat efficiency ect.，this paper reveals that the architectural design of Wan Mansion complements the integrity of Shenyang's modern architectural development.