Aiming at maintenance management of distribution network, this paper proposes a new maintenance technology based on risk assessment. It includes the procedure of risk assessment and the method of decision-making. The basic technical framework, which applies RBM to the maintenance management of distribution network is established. In the risk decision-making, the maintenance cost and maintenance profit concepts are introduced. With the help of risk assessment theory and interval analysis, the proposed technology is much more economical and operable. Application of the technology in an actual distribution network shows that it can evaluate the risk of equipment comprehensively and make decision-making quick and effective. Therefore, the technology proposed has good application prospect.