In the construction scheme of Central China electricity market the main transaction mode of Central China electricity market has been proposed， which adopts long-term bilateral transaction primarily and short time spot market as an auxiliary. Aimed at the trans-provincial bilateral transaction problem in Central China electricity market， a transaction simulation based on high-low match methods and the transaction modes are proposed. The models are used to measure the volume in many cases， and the impact of bilateral transaction on main market players is analyzed. The proper transaction mode and appropriate bidding space are put forward by discussion. The conclusion of the paper provides decision-making reference for the construction of electricity market.