This paper aimed to identify the architectural characteristics of the chimi excavated from ancient ruins, especially middle gate remains of Bunhwangsa Temple in the Unified Silla period. Middle gate had planned 3 × 2 with 295㎜ measuring unit and gabled building. Detailed study of the shape of chimi of the middle gate restored by related field experts reveals as follows. 1) Height of chimi is 4.5(130.6㎝) of Tang’s system of measurement classified as large one. 2) The front and back side square hole is made for transverse timber placement. 3) Position of chimi is not the end of the ridge of roof, it moved toward the center. 4) Construction method of chimi is structured with smaller beam and center column. 5) Width and height of the ridge is less than 38㎝ and 54㎝ to be approximately, Width and height of the gabled ridge is less than 38㎝ and 50㎝. 6) This chimi is considered to be very unique when compared to existing ancient restored chimis, it is designed to be advantageous to the chimi construction.