It is an inexorable trend that offshore wind farm be constructed in deep sea in future. The existing installing technology and foundation can’t meet the new need of deep sea environment. Some new technologies will be the mainstream, including floating foundation, integral installation, self-propelled and self-elevating ship and so on. The sea near to middle-latitude zone in the northern hemisphere has unique advantages and active demand to develop wind power generation in deep sea. We need to draw up a plan to develop wind farm projects and technologies as early as possible.