Electricity transaction involves the data which is closely related to the interests of the enterprise, such as the entry of the market members, the declaration of electricity transaction, the settlement and the execution of the contract. It is necessary to take the necessary measures to ensure the security of the electricity transaction data while completing the electricity transaction. By combining the block chain technology, the information security strategy is formulated to effectively guarantee the security of the power transaction data, to solve the friction of the electricity transaction, to promote the legitimacy of the power transaction and to maintain the normal order of the market.