In the study,the contents of three major nutrient elements in decomposed SMS from Pleurotus mycelium production were determined.The aqueous extract (AE),ethanolic extract(EE) and humus were extracted from this kind SMS,and their growth-promoting effects on seedlings of lettuce,maize,eggplant and cucumber were evaluated by foliage spray in various concentrations in an orthogonal experiment.The main results were as follows:the total contents of nitrogen,phosphorus and potassium were 0.21%,0.95%(P₂O₅ %) and 0.62%(K₂O %) respectively.The extraction rates of AE,EE and humus were 4.05%,0.31% and 23.31%respectively.The increment of maximum leaf length was sensitive to the stimulation of the extracts and could be taken as a simple index for evaluating growth-promoting effects of different extracts in a short experiment period.The growth-promoting effect of humus was 1.48 times that of Nuobeining,a commercial foliar fertilizer.The effect of AE was slightly better than that of Nuobeining and inferior slightly than that of EE,but the differences among them were not significant.