Caragana korshinskii Kom. is widely distributed on the Loess Plateau, China, and it is a very ecologically adaptable shrub with an extensive root system capable of adsorbing large amounts of water and resistant to adverse environmental conditions. Moreover, Caragana korshinskii Kom. is the main shrub species for semi-arid loess hilly region to create of soil and water conservation forest. Therefore, it is necessary to explore the influence of Caragana korshinskii Kom. on the soil water resources in semi-arid loess hilly region. Plant density is one of the most important factors affecting the soil water resources, there are many studies on relationship between plant density and soil water resources, and also some researches about the effect of plant density on plant growth. However, rather less attention has been paid to the effect of plant density both on plant growth and soil water resources. The influence of density on soil water and plant growth has great significance on forest vegetation restoration and ecological construction. The effects of Caranaga korshinskii Kom. forest density on plant growth and soil water volumetric content under the same site condition were conducted by long-term in-situ observation and analysis. The results showed that there are significant differences between the different density treatments of 1 to 5-year-old Caranaga korshinskii Kom. woodland. The soil water resources increased with the increase of plant density from the third year. However, the Soil water resources were negatively correlated to plant density of 10 to 12-year-old Caranaga korshinskii Kom. treatment (except Treatment 4,T₄) and the differences between the different density treatments were not significant. The plant height growth was positively correlated to plant density for 1 to 3-year-old Caranaga korshinskii Kom. treatments. The excessive high density restrained the plant height growth from the fourth year. The basal diameter increased with increasing density of the 1 to 5-year-old Caranaga korshinskii Kom. woodland, but the differences caused by density were not significant. The plant height and basal diameter growth were both restrained under the condition of excessive high(Treatment1,T₁) or low density(T₄) of 10 to 12-years-old Caranaga. The soil water resources of the maximum infiltration depth layer in high-density experimental treatment (both T₁ and Treatment 2,T₂) dropped to the soil water resource use limit at the fifth year of Caranaga korshinskii Kom. growth, meanwhile, the plant density should be reduced by cutting according to the soil water carrying capacity for vegetation in order to reduce the soil water consumption and realizing the sustainable utilization of soil water resources in this situation.