The experiments were conducted under conditions of simulating field undisturbed soil with 8 replications.The contemporary wheat variety,Xiaoyan No.6 was used.Results show that under soil relative water content(SRWC)as 40%～70%,as soil water strees developing,root system growth of wheat was limited,root water potential(Rw),evapotranspiration(ET),root length(RL)and root dry weight (RDW) were reduced obviously.as water content increasing,Rw and ET increased obviously, but RL and RDW were curve distribution.The ...