The purpose of this study is to examine the standard scale of measuring a block of Kyongju(慶州), the Capital of the Silla Dynasty(B.C.57${sim}$A.D.935). Through the study, it is clarified that 1). the block of Kyongju city is planned and divided by using the eight-Zhou-foot(周尺) as a standard scale, which is equivalent to the length of one-bo(보(步); 2). the distance between the center of the streets is around 100 bo and the width of the block is around 90 bo; 3). the distance between the streets is very near to the distance 167.054m of Jing-tian-zhi(井田制), which supports the use of Zhou-foot as a standard scale. As a result, it can be maintained that the city planning of Kyongju is related to that the Jing-tian-zhi of the Zhou Dynasty and the standard scale of measuring a block of Kyongju us executed by using the eight-Zhou-foot standard scale.