As a kind of novel data structure organization

block chain technology is applied gradually in the study of energy internet.In order to exploit application potential of block chain technology in the distribution network further

a kind of distributed state perception and optimization method based on blockchain technology is proposed to replace the traditional optimization method which takes reliable communication as premises.With this method

sparse communication network is constructed in the block chain nodes of the distribution network through distributed arrangement.Small number of information is relied to interact with information and estimation method is adopted to achieve distributed state perception of the operation condition of distribution network.Then

the optimization model is subject to decentralized treatment and the convex relaxation method of second-order cone programming（SOCP） is combined to make the model convex and relaxed.Finally

the alternating direction method of multipliers（ADMM） is used to realize the whole distributed solution of the problem.The improved PG&E69 bus system is taken as an example to simulate and analyze the system under normal and fault communication conditions.It is shown by the result that the method has the advantages of low communication burden

high accuracy and can effectively improve the optimal operation capability of distribution network under weak communication conditions.