According to the experiment condacted by combining the extracr}n method reported in recent years for measuring soil microbial biomass C with the practices of chloroform-fumligation method used in our works, a new method by the way of heat-sterilization, salt-extraction and volumetric analysis for measuring Microbial biomass C in acid soil is suggested. This methed is more convenient and efficient, and the measuring period can be, greatly shortened as conpared with tlxe chloroformfumigation method.