【Objective】The purpose of this study is to illustrate effects of incorporation of organic material on organic carbon of the heavy fraction and composition of soil aggregates in the soil in the hope that the work may be of some important significance to scientific evaluation of the effects of incorporation of crop straw into the soil on soil fertility and the environment.【Method】An in-lab experiment was carried out incubating for 120 days columns of albic soil with corn stalk incorporated into top soil and parent material at a varying rate, and then analyses done for accumulation of organic carbon of heavy fraction, composition of soil aggregates and distribution of organic carbon in various fractions of soil aggregates as affected by incorporation rate of corn stalk.【Result】It was found that content of the organic carbon of heavy fraction in both the top soil and parent material increased simultaneously with the increasing incorporation rate of corn stalk. The two soils did not differ much in increment of the content of the organic carbon of heavy fraction, showing a slight difference of being only 0.34 g kg^-1. However, they varied sharply in increasing rate of organic carbon. In the top soil, organic carbon increased by 85.51% only and in the parent material by 556.23%. It was also found that, the incorporation of stalk promoted transformation of small aggregates (<0.25 mm) to large aggregates (> 0.25 mm) in the soil. When the amount of corn stalk added is too high, > 2 mm size aggregates no longer increase but decrease. When corn stalk was incorporated at a rate of 3% and 2%, the fraction of large aggregates contributed the most to the content of organic carbon in the soil reaching up to 69.90% and 65.48%, respectively.【Conclusion】 In this study, the addition of stalk promoted accumulation of organic carbon of heavy fraction and formation of large-sized aggregates and increased organic carbon content in aggregates in various particle-size ,adding the appropriate amount of corn stalk can increase the contribution rate of organic carbon in the large-sized aggregates fractions. Compared to the top soil, that in the parent material soil had organic carbon increased by a far more high rate. The effect of the addition of extraneous carbon increasing organic carbon content in aggregates of all particle sizes was more apparent. The soil in the parent material layer was much higher than the top soil in carbon sequestration capacity, in the case that the former almost contained nil of organic carbon.