This research was to analyze the border signal-fire which is the main facility of military protective duty for safety of sea side in chosun dynasty. The results of this research were described separately as follows. 1. Five types of site plan of signal-fire were observed, which is circle, half-circle, oval, round-rectangular. The majorities were circle type in eastern area. 2. Plan configuration of signal-fire stand which is separated with circle, rectangular type roughly was constructed with circle type generally. The height of signal-fire stand was about 2～3m. The diameter of signal-fire stand was 8～10m. Building base that protect ground moisture and infilteration of rainfall was found in 9 border singal-fire, the height of it was about 0.3m～2.5m. 3. Trench was mainly circle type and average width was 3～4m. However the depth was almost observed as 1m, originally, it was estimated it has more depth. 4. The height of protective wall remained until present was about 1m, the depth was about average 2.5m. 5. The storage of border signal-fire has rectangular dimension, several types of 1.8×1.2 m～5.7×4.4m, square(間) of 1×1～2×1. The building material was stone and located below or near the signal-fire stand.

Signal fire was a communication system which deliver urgent news by smoke and light. It informed the condition of the border to the central government and the military base rapidly. This research was to analyze the border signal-fire which is the main facility of military protective duty for safety of sea side in chosun dynasty. The results of this research were described separately as follows. 1. The border signal-fire has three types of facility layout, The majority was one-site, near two-site, separate type. The majority was near two-site type. 2. Plan configuration of signal-fire stand which is separated with circle, oval, round-rectangular and rectangular type roughly was constructed with circle type generally. Four types of signal-fire stand was observed in southern and western sea side impartially. However, in eastern side, circle type of signal-fire stand was mainly found. Therefore, regional characteristics could be considered partially. 3. The height of signal-fire stand was about 8～10m. The diameter of combustion chamber on the signal-fire stand was 2～3m in circle type, and the dimension of rectangular type was about 1.9×1.9～3.2×3.0m. 4. Building base that protect ground moisture and infilteration of rainfall was found in 10 border singal-fire, the height of it was about 0.3m～2.5m.