Soil quality is a significant indicator for soil qualityevaluation.Understanding the characteristics of soil qualitychange is the criterion for agricultural development and soil management.There is a lack of research on the changes of soilquality after the transformation of meadow soil dryland to paddyfield.This study takes the meadow soil of Sanjiang Plain asthe surveying object，and investigates the changes of soil physicochemical properties with the increase of rice growing agesafter the transformation of meadow soil dryland to paddyfield.The results indicated that after growing rice in the meadowsoil，the soil organic carbon content in the plough layer and the core soil increased with the increase of rice growingage.Thetotal amount of reducing species in each layer of soil increased with the increase of rice growingage.The Fe 2+and Mn2+content in the ploughed soil reached to the highest value in the 6～10 a，and then migrated downward，reaching to the highestvalue in the core soil at 40a.The soil solid phase ratio and total pores changed irregularly in the initial stage of ricegrowing，when the rice was grown for 40a，the soil solid phase ratio increased in the core soillayer，and the pore with the diameter of<0.000 2 mm obviouslyincreased.With the increase of the rice growingage，the ratio of 0.02～ 2 mm granules in theplough layerincreased，<0.002 mm granules decreased and leached down to the heart soillayer，and the ratio of <0.002 mmgranules in the core layerincreased.After the rice growing in the meadowsoil，some physicochemical property changes of soil have the characteristics of paddy soil development.