Purpose of the project was development of reinforced concrete design by way of working stress design to be easy to use, reliable, and safe and could be actually works. The program was easy to communicate with users and easy to understand in filling data part, then show the preview list of calculations and example images of reinforcement. In the program, there were many types of reinforce concrete design, this project has Visual.net language in program development witch run various functions. As a result, the development program on the window systems has simple steps and convenient to used and under the basis of working stress design as the core. The working stress design method is used for a long time, alongside the E.I.T. standard. The result obtained are safe and it can be applied to the construction design.