A method of controlling a water-pump of an air conditioning system used in an active air conditioning water circulating system includes: detecting an environmental parameter and a load value of the active air conditioning water system actively; adjusting a flow rate of a water-pump of the active air conditioning water system according to a first control logic when the environmental parameter is less than a first pre-default parameter and the load value is less than a load threshold; and, adjusting the flow rate of the water-pump according to a first control logic when the environmental parameter is not less than the first pre-default parameter or the load value is not less than the load threshold. The present disclosed example can enhance a flow control capacity for different environmental statuses via controlling the flow rate in the different environmental status according to the different control logic.