A wind farm includes a plurality of wind power generation units. The wind power generation units include a rotation axis, a hub, at least two airfoil blades, a pitch control system and a yaw control system. The rotation axis is defined as horizontal rotation. The hub is located at a first end portion of the rotation axis. The two airfoil blades are radially mounted on the hub. The pitch control system is configured to adjust a pitch angle of the blades mounted on the hub. The yaw control system is configured to horizontally rotate the rotation axis of a nacelle on the base of a tower in order to align the direction of the rotation axis with a wind direction. The wind farm includes: at least two first-direction wind power generation units spaced apart from each other at a predetermined interval and whose blades are rotated in a same direction; and at least one second-direction wind power generation unit that is located next to one of the first-direction wind power generation units and has blades rotating in an opposite direction to a rotational direction of the blades of the first-direction wind power generation unit.
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