Abstract: Using rare earth agricultural light,invented by Chinese Academy of Sciences recently,as experimental light,the effects of the different wave length lights and different light time had been investigated on the tomato growth and flowering.The results showed that,compared with the control group and the ordinary LED light treatment,seedling index of the treatments with 450 nm、650 nm and 450 nm ＋650 nm rare earth agricultural lights were increased,adding blue and red light 6 h were more conducive to the formation of high quality seedling and the seedling index was increased with the increasing light time;the initial floral node with filling light was raised,meanwhile,the initial flowering time of tomato was also delayed.