This study aims to investigate and analyze the plan and structural system of 4 kan(間) by 4 kan(間) square church built in early 20th century. At that time, three kinds of traditional wooden structure church had been built under the circumstances of transitional era : Basilica style such as Ganghwa Anglican Church, ‘ㄱ’ shaped style such as Keumsan Church and 4×4 Square style such as Bukok Church and Jacheon Church that are concerned in this study. Traditional plans and structural system were mixed with new religious function and transformed into korean peculiar style. 4×4 Square style is a residual product in that process. Despite of it, little concerns on it till now. The results of this study are described as follows. 1. The plan of these 4×4 square churches is divided into three areas : cathedra(1×1), attendance(4×2), and intermediation(4×2). The location of cathedra is commonly the opposition part of main gate and projected out of the building. Attendance area was also divided into two, man and woman, because of keeping a distance with each other. 2. The structural system of these 4×4 square churches are somewhat different because of their size and roof style. In the case of Bukok church, 4×4 square fall off 3×3 and 2×2 gradually and turn into paljak(八作) roof, which enable us to get in traditional entering methods. On the contrary, Jacheon church use hipped roof but almost alike pyramidal roof, which could make us not to recognize entering in the aspect of gable part.

Many researches on the typology of 'Maru'(Wooden deck) in Korean traditional houses have mainly focused on the high-class houses in the central region of Korea. They were mainly concerned on defining Maru's typology by social status of the owner, based on the researches regarding its physical and spatial properties. Maru in the high-class traditional houses has been served as an essential architectural feature showing the social status of owners as well as adapting in the region of humid and hot summer. This research investigated the typology of Maru's placement in traditional single houses of four Kan in Chonnam province, which shows many differences in its placement according to the regions. Research results show that the typology of Maru's placement and openness is different with the location of houses within the region. This difference affects on the circulation of movement, which eventually affects on the pattern of space use. The difference is also very likely to be affected by the natural environment of geography and climate of the region.