Mineral elements absorption and content of Lactuca sativa under different spectral component conditions were studied by ICP-AES technology. The results showed that: (1) For Lactuca sativa, the average proportion for Ca∶Mg∶K∶Na∶P was 5.5∶2.5∶2.3∶1.5∶1.0, the average proportion for Fe∶Mn∶Zn∶Cu∶B was 25.9∶5.9∶2.8∶1.1∶1.0; （2）The absorptions for K, P, Ca, Mg and B are the largest under the LED treatment R/B=1∶2.75, red light from fluorescent lamps and LED can both promote the absorptions of Fe and Cu; （3）The LED treatments exhibiting relatively higher content of mineral elements are R/B=1∶2.75 and R/W=1∶1 while higher dry matter accumulations are R/B=1∶2.75 and B/W=1 ∶1.