Light is one of the most important environmental factors affecting the growth and development of facility vegetables. Light environment regulation has become a hot spot in facility environment research. Traditional light environment control adopts common electric light source or filter film，which can not accurately modulate the spectral energy distribution quantitatively. With the rise of new semiconductor light source，LED supplementary light is widely used for its adjustable light quality ratio combination，spectral energy distribution，etc. This paper discussed the effects of light environment on horticultural vegetables in solar greenhouse，and expounded the recent years research on light environmental characteristics inside of facilities，and regulation of natural and artificial light environment in horticultural facilities. At the same time，the paper also prospected the future research direction.