Charging management methods and systems for electric vehicle charging stations for use in a charging field with charging stations are provided. First, a server instructs a first charging station to perform a first charging operation for a first electric vehicle via a network, wherein the server sets a first target power parameter value corresponding to the first charging operation, and the power output from the first charging station to the first electric vehicle in the first charging operation will not exceed the first target power parameter value. The server monitors a first power output value actually output from the first charging station to the first electric vehicle during the first charging operation, and determines whether to adjust the first target power parameter value of the first charging operation according to the first power output value and the first target power parameter value.