A wind driven power generation system comprising: a wind power generator, a laser aerovane (100, 200, 300) either mounted on said wind power generator or arranged near the wind power generator and configured to measure direction and velocity of wind blowing toward said wind power generator, and an output-smoothing device connected to said wind power generator and configured to store and release electric energy; wherein said laser aerovane (100, 200, 300) is configured to observe a wind velocity vector of a wind blowing toward said wind power generator in such a way that the laser aerovane (100, 200, 300) is configured to receive, by using a horizontal wind-velocity detecting optical system section and a vertical wind-velocity detecting optical system section, a scattered wave, in which a laser beam, which is emitted from the laser aerovane (100, 200, 300) in a front direction of the wind power generator, is scattered by hitting against aerosol that exists at a position located at an arbitrary distance from the wind power generator, floats in the air, and moves with wind at the same velocity of the wind, whereby a frequency shift, according to the Doppler effect, between the laser beam and the scattered wave thereof is detected, and adjustment of power produced by said wind power generator is calculated in advance of arrival of the wind observed by said laser aerovane (100, 200, 300) on the basis of results obtained by the observation, power output of the wind driven power generation system including said wind power generator and said output-smoothing device is controlled on the basis of conditions obtained by the calculation, and wherein said output-smoothing device is configured to carry out output control of the wind driven power generation system by storing electric energy produced by said wind power generator, when the power produced by said wind power generator is larger than a target value, and releasing electric energy from the output-smoothing device, when the power produced by said wind power generator is smaller than the target value, so that power output fluctuation of said wind driven power generation system is suppressed when the wind observed by said laser aerovane (100, 200, 300) arrives at said wind power generator. a wind power generator, a laser aerovane (100, 200, 300) either mounted on said wind power generator or arranged near the wind power generator and configured to measure direction and velocity of wind blowing toward said wind power generator, and an output-smoothing device connected to said wind power generator and configured to store and release electric energy; wherein said laser aerovane (100, 200, 300) is configured to observe a wind velocity vector of a wind blowing toward said wind power generator in such a way that the laser aerovane (100, 200, 300) is configured to receive, by using a horizontal wind-velocity detecting optical system section and a vertical wind-velocity detecting optical system section, a scattered wave, in which a laser beam, which is emitted from the laser aerovane (100, 200, 300) in a front direction of the wind power generator, is scattered by hitting against aerosol that exists at a position located at an arbitrary distance from the wind power generator, floats in the air, and moves with wind at the same velocity of the wind, whereby a frequency shift, according to the Doppler effect, between the laser beam and the scattered wave thereof is detected, and adjustment of power produced by said wind power generator is calculated in advance of arrival of the wind observed by said laser aerovane (100, 200, 300) on the basis of results obtained by the observation, power output of the wind driven power generation system including said wind power generator and said output-smoothing device is controlled on the basis of conditions obtained by the calculation, and wherein said output-smoothing device is configured to carry out output control of the wind driven power generation system by storing electric energy produced by said wind power generator, when the power produced by said wind power generator is larger than a target value, and releasing electric energy from the output-smoothing device, when the power produced by said wind power generator is smaller than the target value, so that power output fluctuation of said wind driven power generation system is suppressed when the wind observed by said laser aerovane (100, 200, 300) arrives at said wind power generator.