Driven by the requirements of grid parity, load reduction and efficiency improvement, wind turbine blades show a development trend of large-scale, lightweight and high-performance. This will lead to more flexible blades, for example, more obvious bending and torsional coupling of blades. As a consequence, vibration problems will easily occur under uneven flow, resulting in the failure and shutdown of wind turbines and even safety accidents such as blade breakage and tower collapse. In order to maintain the safe and stable operation of the turbine, blade vibration suppression is becoming increasingly important. In this paper, the vibration problem of the wind turbine blades is described briefly, and the corresponding vibration mechanism is analyzed. Two kinds of vibration reduction strategies are introduced and summarized in detail, including the load fluctuation reduction and damping increase.