Large consumers direct power purchase plays a crucial role in supporting the national industry, facilitating the real economy development, and promoting local economy prosperity. Combined the current situation of large consumers direct power purchase in our country nowadays, this paper summarizes the relevant transaction principal members, types of transactions, transaction process and the settlement methods associated with large consumers direct power purchase in southern region, and analyzes the advantages and disadvantages of the related transaction types and settlement modes. Finally, the paper discusses the challenges and problems to be solved for large consumers direct power purchase, and reviews the possible applications of applying block chain technology.