Effects of pig manure on properties of yellow-brown earth were studied in a incubation experiment for 427 days under submerged condition without percolation.Manure applied at the rates of 0 (as the check),1,3,5,7 and 9% of soil weight.The results indicated that the decomposition rate of manure was not influenced by the application rate.The organic material in the manure remained in the soil was 54.870,of which 38.7% was transformed into soil organic matter and 16.1% undecomposed;62.3% of nitrogen of the manuer remained in the soil.Hydrolyzable N was closely related to the soil total N (r=0.985^**,n=18).