Method of using high-sulfur coal and Low-grade pyrolusite to produce manganese is a new process. This article takes advantages of AHP and proposes a new way to research this system. This paper also builds a model of this system in order to compare with the traditional one. It could make readers understand its advantages easily. Meanwhile, this paper use three-scale method to determine the proportion. It could reduce the factor of human speculation in the whole process. So it lays a good foundation to make a reasonable decision. Use AHP to determine the three-scale weight of each index and analysis the pact of this system in respect of social-economic, resource and environment. Finally, it is confirmed that the new technology is superior to the traditional process of producing electrolytic manganese.