a method for optimization of operating parameters of a wind energy installation defines an upper and a lower interval limit value for a parameter to be optimized . the method includes carrying out a cycle with alternate operations of the wind energy installation with the interval limit values , with a data record in each case being produced with a target variable over a variable number of repetitions . the data records relating to the interval limit values are evaluated to form a quality measure , and the interval limit value with the poorer quality measure is identified . then , at least the interval limit value with the poorer quality measure is replaced by shifting through a step value δ in a direction of another interval limit value . the cycle is then repeated .