[Objective] Changing trends of size hierarchy and stability of soil aggregates in solar greenhouse soils were illustrated along years of plantation to provide some theoretical bases for the change of soil structure in vegetable cultivation.[Methods] Soils with different plantation years in four vegetable greenhouses(with 2, 5, 8 and 16 years of plantation)in Xinmin City of Liaoning Province were selected as the research objects, and nearby soils in open fields outside of the greenhouses were selected for comparison. Indices of composition, mechanical stability, water stability and damage rate of soil aggregate were measured.[Results] Within 5 years of plantation, quantity of >0.25 mm, mechanical stability and water stability of soil aggregates showed a decreasing trend along plantation, and they were lower than that of the comparative soil in open fields; After 5 years of plantation, they all were elevated significantly. At the beginning of the cultivation of the tested soil, organic matter didn't play its role in the aggregate formation and stability maintenance; While, with the increase of planting time, organic matter began to promote the formation and maintain the stability of soil aggregates.[Conclusion] The stability of soil aggregate in the regional greenhouse decreased firstly and then increased with the increase of the planting years.