The invention relates to the technical field of mobile terminals, and provides a hydropower water release and additional issue transaction management method and system. The method includes the steps that a mathematic model aimed at least comprehensive power purchase cost, the minimum power consumption and the lowest pollution discharge level is built, and the model is a multi-target optimization model; by means of a linear weighting method, the multi-target optimization model is converted into a single-target optimization model with compressive cost as a target; a unit order table is built; a hydropower emergency transaction mode is built on the basis of the unit order table; water release power sharing is carried out according to the transaction mode, cost is calculated according to a water release power price, and a transaction is finished. According to the method, the mathematic model for energy-saving power generation scheduling suitable for trans-provincial area power market situations is built, the mathematic model integrates economic benefits and hydropower water release and additional issue. By means of a heuristic method, the mode suitable for hydropower emergency transactions of the central China area is designed, and transaction computation and control is carried out according to the mode.