The invention provides an estimation method and system for the geographic position of a base station. The method includes the steps that internet access parameters of all user terminals of a first base station with the geographic position to be estimated are obtained, and corresponding weights of all the user terminals are determined according to the internet access parameters of all the user terminals respectively; the position x, which enables the sum of first distances between all the user terminals and the first base station to reach minimum, of the first base station is calculated; the position distances of the user terminals are multiplied by the corresponding weights to serve as the first distances between the user terminals and the first base station; the calculated position x is stored as an estimation value of the address position of the first base station. The estimation method and system can estimate the geographic position of the base station.