Abstract: With the reform of electricity market， micro-grid or users with distributed generation are allowed to participate in electricity market transactions as the main power sellers. However， under the existing conditions， energy transaction is faced with the problem of lack of trust and centralization. Blockchain technology， as a new distributed encryption method， is of great significance to realize fair， point-to-point， real-time and untrusted energy trading among users. Firstly， this paper introduces the existing blockchain energy trading project， and analyzes and the Baas platform available to developers. Then the P2P energy transaction network and transaction algorithm using blockchain technology are designed， and the application process of the blockchain Baas platform is analyzed. Finally， the operation examples of three distributed PV users in a park are used to illustrate the decentralization， transparency and hard to falsify of the microgrid energy transaction under the blockchain technology， and to promote the safe and efficient operation of the microgrid and the effectiveness of the greatest social benefits.

Key words: blockchain, blockchain as a service （BaaS） platform, decentration, energy transaction