This paper studies the construction, extension, modification and currently scheduled-to-demolition of the First Field Postal Station at Kinmen (formally known as Quemoy), in an objective of reflecting and periodising the modernisation and modernity of Kinmen architecture between the 1950s and the 1980s. Careful and thorough study on these dates of architectural development in Kinmen has yet been done as literature review shows. This paper reconstructs the construction methods, the works, the society and the aesthetics based on the day-to-day information collected from newspaper and publications in the third part, before proposing an impression of Kinmen’s time of modernisation and modernism in the fourth part. The First Field Postal Station was built in 1957, and was altered and extended due to increasing postal service-personnel and introducing machines and mobiles in the 60s and 70s. The postal station’s form, style and capacity reached its completeness before 1981, and met decrease afterwards. The station was a result of Kinmen’s modernisation in building methods and materials since 1954; it is so argued. The paper also argues the period between 1968 to 85 to be Kinmen’s second stage of architectural modernisation for building technologies, and that the modernisation supported the sociological need of new aesthetics. Instead of focusing on the artist-centred epistemology of architectural history, this research concerns more the historiographical attitude that technologies, labour-skills, and material-supply formed the aesthetics of architecture. The application of mobile vehicles and mechanical equipment shaped on the other hands the sections and the plans of a building. This anonymous design of public building has reflected its time and its society under the martial law, however, this paper also argues, the insufficiency of the Kinmen building industry overpowered the political moral of the time.