Abstract: The spatial distribution and quantitive characteristic of Populus euphratica and Populus pruinosa flowers from different inhabited environment was studied.The results showed that the height,undermost and topmost position of flowers,the lower limit and upper limit catkin concentration of male trees were lower than that of female trees.The distributed range of catkins of male and female trees had a wider superpose.The order of male catkin quantity in the canopy was middle > upper > under and that of female catkins quantity was upper > middle > under.The quantity of catkins of a tree,the number of anther of a inflorescence,the quantity of pollen of a anther and a catkin of Populus euphratica were little than that of Populus pruinosa.The stastic showed that the quantity of catkin of a tree,the number of inflorescence of a catkin and the quantity of pollen of a anther were relatively stable,and the quantity of catkin of a tree of Populus pruinosa male trees was stable.

Key words: Populus euphratica, Populus pruinosa, flower, spatial distribution, quantitive characteristic