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 $2{sim}3m$. The diameter of signal-fire stand was $8{sim}10m$. Building base that protect ground moisture and infilteration of rainfall was found in 9 border singal-fire, the height of it was about $0.3m{sim}2.5m$. 3. Trench was mainly circle type and average width was $3{sim}4m$. 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 $1.8{ imes}1.2m{sim}5.7{ imes}4.4m$, square(間) of $1{ imes}1{sim}2{ imes}1$. The building material was stone and located below or near the signal-fire stand.