H-beam used for stiffening upper structure of Ocean Plant is cut in various shapes. This process has been done manually and there has been no optimized robot system for the automation of H-beam cutting. To increase productivity and quality, an automation system has been requested. In general, the automation cutting system uses plasma for cutting, but the system in this study uses hybrid of plasma and gas because of special cutting shapes of H-beam. In the process of developing new system, process is improved and evaluated by simulation. In spite of the advantages of simulation, it spends too much time to organize the environment of simulation for each H-beam shapes and there is a number of cutting shapes. To solve that problem, we developed a program organizing the simulation environment automatically, including the function of making shape information of H-beam. This program has a visualization function of cutting shape to prevent input mistakes by workers. All data can be reused from the database.