THIS ARTICLE FOCUSES THE PROBLEM THAT FLOOR AREA RATIONS ARE NOT FILLED WELL IN THE COMMERCIAL ZONE AT THE CENTRAL AREA OF LOCAL CITY AND STUDIES THE CONDITIONS OF LOW FILLING AND THOSE FACTORS. WE ASSUME 1)THE DECREASE OF AVAILABLE FLOOR AREA RATIO BY REGULATIONS AND 2)THE EXCESSIVE DESIGNATION OF COMMERCIAL ZONE AND FLOOR AREA RATIO，AS THE FACTORS OF LOW FILLING DEGREE. FOR THE FIRST FACTOR, THERE ARE 3 REGULATIONS， ONE BY OBLIQUE LINE, ONE BY NARROW ROAD AND ONE BY CONDITION OF CONTACTING ROAD, AND AT EVERY LOT THE SECOND ONE EFFECTS VERY MUCH. FOR THE SECOND FACTOR, WE CONFIRM THE EXCESSIVE DESIGNATION COMPARING THE ECONOMIC ABILITY OF THE CITY.
