Abstract: From Tanabe edge of a farm in Zhen Gang Temple home village， Pingshan County， Hebei Province， randomly selected 17 different diameter sizes Zizyphus jujuba var. spinosa as research material to measure related metrics of single plant， and then establish an expansion parameter of single Zizyphus jujuba var. spinosa water consuming scaling. Base on the data of tree height， ground diameter， discussed regression relationship between the sapwood area and these parameters， and established a regression model. Moreover， we consulted the measured values and correlation coefficient， and then choose the regression model. According to the correlation coefficient， model， measurement test， and how difficult it was to measure， we determined the expansion parameter of Zizyphus jujuba var. spinosa water consuming model. In the results， ground diameter， aboveground biomass and whole plant biomass were choosing as the expansion parameter of jujube water consuming model. The concrete model as following: ground diameter and sapwood area was Y=045936D2g+088467Dg-097092， R2=0997；whole plant biomass and sapwood area was Y=26×10-12W3-11×10-7W2+000215W+096432， R2=0994; intermediate models was whole plant biomass and ground diameter: W=92702 D2g-2366Dg+15778， R2=1; aboveground biomass and sapwood area was Y=86×10-12W3a-26×10-7W2a+000321Wa+107127， R2=0940; intermediate models was aboveground biomass and ground diameter：Wa=68113 D2g-18902 Dg+13509， R2=1000.