In order to determine the contentof organic carbon in batch of soils accurately andefficiently，the colorimetrictube wasselected instead of the boilingtube，the soil was digested by steamheating，and the organic carbon content wasdetermined by flow analyzermethod，and this method was compared with the potassium dichromate oxidation external heatingmethod(conventional and universal)to explore the feasibility of the method. The results showed that the relative standard deviation of the repeated experiments for the determination of soil organic carbon by steam bath-flow analyzer was 3.19%-9.41%，and the recovery was 92.21%-97.63%. The precision and accuracy of the method were good. There was no significant difference between the measured results and those determined by potassium dichromate oxidation-external heating method(P>0.05)，the regression equation of the two methods wasy(steam bath-flowanalyzermethod)=0.947x(potassium dichromate oxidation-external heatingmethod)+1.621(r2=0.933)，the correlation between them was good. Two methods were used to determine 200 soil organic carbon. The detection time of steam bath-flow analyzer method was 68% that of potassium dichromate oxidation-external heatingmethod，and the manual operation time was 44% that of potassium dichromate oxidation-external heating method. The steam bath-flow analyzer method did not need ferroussulfate，the dosage of potassiumdichromate，sulphuric acid and water used was 40% of that of the potassium dichromate oxidation-external heating method. The steam bath-flow analyzer method had the advantage of lesstestingtime，less manual operationtime，lower workingintensity of personnel，less reagentdosage，reduced environmentalhazards，more accurate and efficient indetection，morequicker and economical inoperation，the method could be recommended for the determination of soil organic carbon in large quantities.