Abstract: Daily light integral（DLI）is the total amount of photosynthetic light delivered to plants each day. In this paper，the effects of DLI on the seed germination，vegetative growth and reproductive growth of plants were discussed，thus providing reference and guidance for setting up proper DLI in plant production. Increasing DLI under low light conditions could promote the growth and development of plants. The germination rate of photoblastic seed was positively correlated with DLI. Appropriately increasing DLI could enhance the growth of root and shoot，increase plant biomass. During reproductive growth stage，increasing DLI could be conducive to flower bud differentiation and increase both fruit yield and quality.

Key words: daily light integral, plant growth and development, light control