Electricity sale quantity prediction method and system and electricity charge prediction method

The invention discloses an electricity sale quantity prediction method and system and an electricity charge prediction method, and the method comprises the following steps: obtaining an impact factor library which comprises impact factors related to the electricity sale quantity for representing a user group; classifying the influence factors to obtain a first sub-influence factor strongly related to the electricity sale quantity of the user group and a second sub-influence factor weakly related to the electricity sale quantity of the user group; obtaining a daily feature vector set and daily electricity sales, and constructing a prediction model according to the daily feature vector set and the daily electricity sales; obtaining a day feature vector of a to-be-predicted day, and inputting the day feature vector into the prediction model to obtain an electricity sale quantity of the to-be-predicted day; according to the method, the first sub-influence factors which are strongly related to the electricity sale