Abstract: A new main factory building is adjacent to the existing main factory building.A corner column of the new main factory building located among two existing auxiliary buildings is unable to be set.The analysis and comparison are made to solve the problems,including calculation unit of the bent frame without low-corner column,setting of the up-corner column,connection schemes between existing building and joists,etc.According to the above result,a better scheme is selected to make use of the side column of existed building to support the new up-corner column.This scheme can meet the commands of current national codes.In this scheme,the joists and supports are designed as simple-structure which is convenient for construction,safe and reasonable.