Abstract: Based on the study of humus and some enzymes' activity in alkali soil treated by different ameliorative ways such as shallow ploughing, manuring phosphogypsum, furfural residue, organic fer-tilizer, constructing manual meadow of Puccinellia tenuiflora or P. tenuiflora-Leymus chinensis and so on, the result show that the content of humus, polyphenol oxidase, cellulase, hydrogen peroxidase and peroxidase activity increase with different degree treated by different ameliorative ways. Further-more, there are well correlations between the content of humus and cellulase activity, between cellulase and hydrogen peroxidase activity.

Key words: ameliorative ways, the content of humus, enzyme activity