This paper deels with the total amounts and cintents of different forms df Zn and Mn in eight kinds of organic manure i.e. stable manure,pig,cattle,sheep,chicken,duck,rabbit and silkworm feces.Meanwhile,the activities of different kinds of enzymes in organic manure were also studied.It was shown by experimental results that organic manure was a good fertilizer for providing plants with Zn and Mn nutrients.Organic manure could increase the availability of Zn and Mn in soil,but as to the effect of organic manure on the mobilization of soil nutrients,a difference between Zn and Mn was found.Organic manure was slow and weak in its supplying-intensity of Mn nutrient to plants,but high in residue for providing available Mn to soil.On the contrary,the effect of organic manure on Zn was just opposite to Mn.After planting two crops——barley and rice,with organic manure combined with chemical fertilizer applied to the first crop,a serious deficiency of Zn in the third crop (late rice) was found.