Wind energy is a non polluting renewable energy, it is inexhaustible, widely distributed. The development of wind energy is paid more and more attention with the requirement of human being to the environment and energy, and wind power will be a renewable and clean energy source in twenty-first Century. Wind energy is one of the most dynamic and renewable energy, which is in essence a form of solar energy conversion, so it can be an inexhaustible supply of energy. The use of wind energy is likely to change the situation that human beings depend on fossil fuels and nuclear fuel for a period of time. By the end of 2002, the world's total wind power equipment has 61000 units, with a total installed capacity of 32 million KW. Wind power technology continues to mature, the single capacity increased from 500KW to 2000KW or higher, the current units have developed 5MW wind turbine.
According to incomplete statistics, from 2002 to 2007 this 5 years, the total demand for wind power equipment for 51 million KW, an average annual growth of 11.2%. It is expected that by 2012, the annual increase in installed capacity is likely to reach 24 million KW, accounting for 2% of the world's total electricity market. By 2020 wind power may account for the world's total electricity will be possible to reach 12%.