Korea has a long history of star maps over two thousand years. The earliest historical star map is the constellation-like cup marks carved on the cover stone of dolmen, which is a typical tomb of Bronze age in Korean peninsula. And many star paintings are founded in Goguryeo (37B.C.-A.D.668) and Goryeo (A.D.918-1392) tombs. The stars in dolmens and mural paintings have various size. The most valuable Korean historical star map is the stone star chart, CheonSangYeolChaBunYaJiDo (hereafter, SSC), which was manufactured in A.D.1395. From the statistical analysis, it is known that the epoch of the stars carved on the SSC is mixed in the first and fourteenth centuries. There are two SSCs in Korea and the later one is a replica of the original. The replica of SSC was manufactured around seventeenth century. The replica has only one-side star chart while the original has two star charts on the both sides. Each star chart contains 1,467 stars with various size, and the size of stars represents the brightness. We measured the position and the size of stars using 3-dimensional high resolution scanners, Vivid and Breukmann. We find several differences of the position and size of stars among the star charts. We particularly examine the size of star in the star charts and compare it with the brightness of star from Bright Star Catalogue (BSC fifth edition). We will present the variations of the brightness of stars in the star charts.