| Experiment was conducted with 4-year-old trees of pear jujube， and observation was made of different
tree pruning form the relationship between tree indicators and canopy characteristics and their impact on water production efficiency. The results show that the larger the tree and the greater the leaf area index，the smaller light transmission rate and the greater density of light interception are; The laryest number of the fruiting unit volume is natural round shape,
increasing by 353.62 compared with CK，and the yield per 667m2 are in sequence as follows: natural round shape> Y-shaped> cylindrical shape> open center shape> standing shape> one-sided shape>CK; The transpiration of treatment increased with the increase of tree size, the tree size of CK is the largest and had the most transpiration, and the transpi-ration is 1.17 times of the natural round shape and 2.65 times of the standing shape ; Calculated according to fruiting water consumption per unit of time，cylindrical shape is highest ，followed by natural round shape， and CK the minimum; The highest water production fficiency is cylindrical which is 3.67(g/h) more than the natural round cylindrical shape,
however, the yield per hectare is 1 984. 68 kg/ 667m2 less than the natural round shape ; The canopy density reached 56.27% in the 111 plant/667m2 for natural round shape, while that for cylindrical shape is only 30. 47%, so the natural round shape fits the density of 111 plant/ 667m2，while cylindrical shape is suitable for denser planting. |