In order to study the anti-light deficiency effects of potassium decomposing bacteria，a pot experiment was carried out under the same nutrient level with the activated potassium feldspar fertilizer and other fertilizers at condition of low light (66%) simulated natural conditions. The results showed that both bacteria treatments promoted the growth of maize at low light condition. T1 (strain Q22) had most obvious effect，and the difference was significant. The results show that the microbial fertilizer has unique advantage of light deficiency resistance，which is worth to be further studied. This provides not only new technical supports for high-yield cultivation，but also open up broad applications scenarios for microbial fertilizers.