Soil liable or recalcitrant organic carbon and nitrogen components are two important indicators of soil organic carbon and nitrogen turnover property.But it is a problem to obtain the components of the samples in a large number.So the original sieving method was improved and a new machine that could sieve more at one time was invented in this study.Two typical soils of upland(black soil and fluvoaquic soil)were chosen to sieve under three mass gradients of 300,200 and 100 g,and each kind of the soil contained four treatments,namely no fertilizer(CK),chemical fertilizer(NPK),chemical fertilizer combined with straw(NPKS),and chemical fertilizer combined with manure(NPKM).Then the differences between the new(300 g)and original(50 g)sieve method were compared to determine the efficiency and feasibility of the new method.The results showed that the average recovery rate of mass,organic carbon or total nitrogen recovery rate,which all above 97%,had no significant differences under three mass gradients of 300,200 and 100 g.There were also no significant difference in liable or recalcitrant carbon（or nitrogen)content.Compared with the results that sieved at mass of 50 g,the mass recovery rate of the black soil or fluvoaquic soil sieved at mass of 300 g increased by 1%~3%.Organic carbon or total nitrogen recovery rate improved by 1%~8%.There were also no significant difference in liable or recalcitrant carbon（or nitrogen）content between the two sieving mass.For example,the liable nitrogen content of black soil under CK treatment,sieved at mass of 300 g,was 0.12 g/kg,which had no significant difference with 0.14 g/kg that sieved at 50 g.The work efficiency of the new method,which increased the sieving mass from 50 g to 300 g,was five times of that of the old method to obtain the liable or recalcitrant carbon and nitrogen components.In conclusion,the new machine could sieve 300 g upland soil sample at one time,and it also improved the average recovery rate of mass,organic carbon and total nitrogen by 1%～8%，compared to the original equipment.So it could be a simple and efficient way to get upland soil liable or recalcitrant carbon and nitrogen components.