Abstract: Capsicums were planted in pots and dealt with aquasorb and three levels of water controlling 100％ field capacity of soil water(FC)，75％ FC，and 50％ FC．The results show that the application of aquasorb can obviously improve the growth and water use efficiency of capsicums The leaf area，leaf number，plant height，biomass and water use efficiency of capsicums with aquasorb treatment are prior to those of non-aquasorb treatments．At the same time，highwater supply can improve the growth of capsicums while low-water supply delays its growth rate．The data processing resuit by grey correlation analysis show that the close extents of relation among the water consume and biomass，leaf area，leaf number，plant height，dry biomass content and root crown ratio are different due to applying aquasorb or not．The relation sequence of applying aquasorb is biomass> dry biomass of stem and leaf> dry biomass of root> leaf number> plant height> leaf area> root crown ratio> dry biomass content．but the relation sequence without aquasorb is biomass> leaf number> dry biomass of stem and leaf> dry biomass of root> plant height> leaf area> dry biomass content> root crownratio.