The effects of Seabuckthorn plant on gully soil improvement were studied by measuring soil organic matter data and employing the methods of comparison and statistic analysis.Field soil and water conservation experiment on Seabuckthorn plant flexible dam was conducted in the east2one2branch valley in the representative soft rock region of Zhungeer County,Erdos City,Inner Mongolia.Results showed that gully soil fertility can be markedly boosted and the growth environment of plant community can be strikingly improved by Seabuckthorn plant.The plant is very significant for the restoration and reestablishment of the region’s ecoenvironment.Idiographic conclusions are as follows:(1)The important resource of gully soil organic matter is the humus made of the multiple earth surface deadwood and defoliation from Seabuckthorn plant flexible dam and metabolism secretion of Seabuckthorn roots.(2)The mean organic matter in surface soil layer of 0-30 cm in gully with the Seabuckthorn plant flexible dam is 1.25 times over that of contrast gully.(3)The soil organic matter content has an increasing tendency from upstream to downstream in the east2one branch valley with Seabuckthorn flexible dam.(4) The mean soil organic matter content of all typical gullies with Seabuckthorn flexible dam in soil profile direction is about 1.8 times that of contrast gully.(5) The organic matter distribution in the soil profile direction is evidently changed by the growth of Seabuckthorn plant and this distribution can benefit the growth and restoration of Seabuckthorn plant and the attached gully plant community in soft rock region.