A method for testing a rotor blade of a wind turbine, wherein a setpoint bending moment distribution is predetermined, comprising at least the steps: - clamping the rotor blade in a clamping device so that a longitudinal axis of the rotor blade extends from a clamping point of the rotor blade, - attaching one or more load frames to the rotor blade, - providing at least two active load-introducing means which each engage on one of the load frames, wherein a first of the at least two active load-introducing means is set up for introducing load in a pivot direction of the rotor blade and a second of the at least two active load-introducing means is set up for introducing load in an impact direction of the rotor blade, - providing at least two passive load-introducing means which each engage on one of the load frames, wherein the two passive load-introducing means are configured such that they each only act in one direction. wherein at least one of the at least two passive load-introducing means is provided for adjusting the system natural frequency in the impact direction and at least at least one of the at least two passive load-introducing means is provided for adjusting the system natural frequency in the pivot direction, wherein at least one of the at least two passive load-introducing means is formed as an elastic element or decoupled mass that is mounted on a rocker, wherein, for a system which comprises the rotor blade and the at least two passive load-introducing means, a system natural frequency for the pivot direction and for the impact direction is varied by the at least two passive load-introducing means, - a cyclic introduction of load is effected by the at least two active load-introducing means, wherein a load introduction frequency f Schwenk of the first active load-introducing means and a load introduction frequency f Schlag of the second active load-introducing means are selected such that the ratio thereof is rational, so that f schlag:f schwenk =n 1:n 2, wherein n 1 and n 2 are natural numbers and n 1 and n 2 are each not greater than 5, and wherein the load frames and the at least two active load-introducing means and the at least two passive load-introducing means are arranged at previously determined positions which are selected in such a way that a bending moment distribution introduced during cyclic load introduction does not fall below the setpoint bending moment distribution and does not exceed it by more than 20%, preferably not by more than 15%, particularly preferably not by more than 10%. - clamping the rotor blade in a clamping device so that a longitudinal axis of the rotor blade extends from a clamping point of the rotor blade, - attaching one or more load frames to the rotor blade, - providing at least two active load-introducing means which each engage on one of the load frames, wherein a first of the at least two active load-introducing means is set up for introducing load in a pivot direction of the rotor blade and a second of the at least two active load-introducing means is set up for introducing load in an impact direction of the rotor blade, - providing at least two passive load-introducing means which each engage on one of the load frames, wherein the two passive load-introducing means are configured such that they each only act in one direction. wherein at least one of the at least two passive load-introducing means is provided for adjusting the system natural frequency in the impact direction and at least at least one of the at least two passive load-introducing means is provided for adjusting the system natural frequency in the pivot direction, wherein at least one of the at least two passive load-introducing means is formed as an elastic element or decoupled mass that is mounted on a rocker, wherein, for a system which comprises the rotor blade and the at least two passive load-introducing means, a system natural frequency for the pivot direction and for the impact direction is varied by the at least two passive load-introducing means, wherein at least one of the at least two passive load-introducing means is provided for adjusting the system natural frequency in the impact direction and at least at least one of the at least two passive load-introducing means is provided for adjusting the system natural frequency in the pivot direction, wherein at least one of the at least two passive load-introducing means is formed as an elastic element or decoupled mass that is mounted on a rocker, wherein, for a system which comprises the rotor blade and the at least two passive load-introducing means, a system natural frequency for the pivot direction and for the impact direction is varied by the at least two passive load-introducing means, - a cyclic introduction of load is effected by the at least two active load-introducing means, wherein a load introduction frequency f Schwenk of the first active load-introducing means and a load introduction frequency f Schlag of the second active load-introducing means are selected such that the ratio thereof is rational, so that f schlag:f schwenk =n 1:n 2, wherein n 1 and n 2 are natural numbers and n 1 and n 2 are each not greater than 5, and wherein