In this study, a multiagent approach was applied into design of energy-saving chemical processes using pinch technology. We have introduced various strategies for simplification of heat exchanger network (HEN) to HEN design agents. Although large and complicated processes were optimized by the multiagent system, there were several cases where the HEN simplification had stopped at the insufficient and inadequate stages. Therefore we improved the strategy to make more preferable HENs. And we showed the effectiveness of improvement and our multiagent framework.