Compared with the traditional Elliott wet screen method, the modified wet screen method can be used to analyze the difference in organic carbon for the wet sieving of each particle size aggregate to the same size. This study selected 25a, 45a and 65a Masson Pine plantations as the research objects. Soil aggregates with different particle sizes were wet-screened by wet screening method. The organic carbon distribution of soil aggregates with different particle sizes in Masson Pine plantation was investigated after wet screening. The purpose is to explore the difference of the organic carbon distribution to the same size after wet screening of aggregates of various particle sizes and its influence on the water stability of aggregates. The results showed that the increase of planting years significantly decreased the water stability of soil aggregates (P<0.05); After wet screening, the organic carbon content of each particle size aggregates decreased firstly and then increased with the decrease of grain size, so as to maintain the highest organic carbon content of the original particle size aggregates (12.96-32.01 g/kg), followed by <0.25 mm particle size aggregates (8.08-23.53 g/kg). Wet sieve agglomerates of various particle sizes allocated to the same size of organic carbon to maintain the highest content of the original size (P<0.05); There was significantly or extremely significantly positive correlation between the water stability of soil aggregates and the organic carbon of the aggregates with the original particle size after wet screening (P<0.05 or 0.01). The smaller the particle size was allocated, the less significant the positive correlation was. In addition, the water stability of aggregates was positively correlated with the organic carbon allocated to the same grain size in the wet screen of aggregates with different particle sizes, and it had the strongest correlation with the organic carbon that maintained the original grain size (P<0.01 or 0.05). The regression equation and correlation coefficient showed that the organic carbon had a significantly or extremely significantly positive correlation with the aggregates with original particle size (P<0.05 or 0.01), and an extremely significantly negative correlation with the aggregates dispersed to other particle sizes (P>0.05 or <0.01). This study concludes that organic carbon is an important cementing material for the formation of aggregates, and the increase of organic carbon content can promote the formation of larger size aggregates. On the contrary, it promotes the conversion of large particle size aggregates to small particle size aggregates. In addition, comparison among aggregates of the same grain size, maintaining the original particle size aggregates have higher organic carbon content and stronger water stability than easily transforming into larger particle size aggregates, which provides a new understanding for the carbon sequestration of aggregates.