In regional electricity market environment, power market matchmaking transaction mechanism is used widely. The power transformation model of competitive integration market is built to meet the various needs, maintain the existing price system and make the social welfare maximization. The power matchmaking transaction based on generation algorithm is used in this paper to find a set of allocation, to maximize the search to the social welfare in numerous electrical distributions. For the purpose of minimizing the transaction risk, definitions of trust, an optimized matchmaking transaction based on generation algorithm are given in this paper.