鼓浪嶼民居住宅門樓之視覺形式，是進入室內空間前最具特色的建築記號。本文具焦於鼓浪嶼民居門樓議題的探究，透過文獻訪談與測繪圖分析，提出門樓的形式意義與記號特徵。本文具體研究結果為：（一）門樓為界定空間內外的具體物質，也是居住者身份地位的表徵，門樓的量體形式主要為單層，亦有雙層形式出現，其裝飾細緻度甚於單層門樓。（二）門樓朝向因應地形與考慮風水因素，並非與建築大門入口一致。（三）門樓視覺形式的構成可分上、中、下層：上層常以山牆、弧拱或拱圈搭配望柱與紋樣。另外，姓氏、建造年代亦作為裝飾語彙；中層常以柱式或紋樣托襯上層部；下層使用踏階元素、基座配置為主要形式。門樓的視覺形式，表達出該時期華僑中西建築樣式並列、合融的居住記號觀。

The visual form of the men-lou in the Gu-Lan-Yu housing is the most characteristic elevation feature and architecture semiotics to be seen before one goes indoors. This paper into the visual form and elevation of housing in the Gu-Lan-Yu, mainly focuses on the exploration of the men-lou topic and by analyzing documents and maps, puts forth the significance and visual form features of the men-lou of housing. The concrete research results are: (1) A men-lou is a specific material to delimitate indoor and outdoor spaces and also a symbol for the status of the dwellers, and the main forms of the men-lou are single-story, with few being two-story. A two-story one is more elaborate than a single-story one; (2) The facing of a men-lou is not always in accordance with that of the entrance of the building, mainly because of the considerations of terrain and feng-shui; (3) A men-lou can be divided into an upper layer, a middle layer and a lower layer. The upper layer is usually furnished with a gable or arch with baluster columns and patterns. A family name and construction date are also inscribed in the decoration. The middle layer serves as a foil to the upper layer by using columns and patterns. The lower layer is furnished mainly with tread boards and foundation supports. The decoration and visual form is semiotics of shows the local Chinese residents’ space concept of integrating Chinese and Western features.