This study is to develop a computer program that a constructor can input the design information of columns, and the program could establish the basic design information data base, calculate the amount of strings, and check the input data to ensure the arrangement of reinforcements agree with the specification, draw the details of the reinforcements automatically. It is very important for a constructor to bid a RC building project or to construct a RC building under the control of budget and schedule. Our program is more effective for constructors to input the design information simplely, and then the program establishs the shop drawing and lists the details of reinforcements of RC building columns automatically.