In this research we take the pot cultured seedling Prunus sibirica、Prunus davidiana、Prunus mongolica and Prunus triloba as the test materials. In order to ascertain the drought-resistant mechanism of four plants of prunus, using the method of artificially control water content, through continuous 28d water stress for drought-resistant physiology indexes determined and new roots anatomical structure observed study of four plants of Prunus as Prunus sibirica、Prunus davidiana、Prunus mongolica and Prunus trilob...