Capacity measuration is the prevailing method of soil organic matter determination.According to the condition of laboratory and the practices of more than 15 years,we improved the condition for calefaction and oxidation of capacity measuration GB1999,and we explored two better methods of soil organic matter determination: oven torrefaction heating method and digestor heating method.It is verified that the results of the two methods are accurate and reliable.The relative errors are less than 1.41%,and the relative standard errors are less than 2.73%.Further more,two methods are quick and easy to operate,and are better than the traditional methods of soil organic matter determination.