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In this Paper, the estimation method of painting process in the automobile plant using computer simulation techniques is studied to improve the bottle neck process, the weak point and the productivity. For model and analysis, Promodel is used which is a manufacturing oriented simulation software developed by Promodel corporation in the U.S.A. Firstly, the result of the simulation shows that we can obtain capability improvement in the system performance using computer simulation. Secondly, the optimum system specification is decided by comparing reports generated by scenario in simulation program to find out the suitable conditions. Finally, the speed of conveyor and a pitch of painting body as the most critical parameters are chosen on the basis of exhaustive field evaluation to study their effects on the capacity of the process. The best alternative condition for the maximum capacity of the process is selected by computer simulation.