Abstract: The imperlment of populus yellow-leaf disease in Henan province extended sequentially,including 50 new regions,but in the old regions the disease didn’t diffused extensively.Relative to2007,the percentage of died populus is decreasing from 1% to 0.6%.The sprouts bourgeoned abnormality in part of the ill populus and its topmost leaves were morbidly small.However they were different from the pathologic witche’s broom.In the autumn and spring,this disease diffused evidently.This disease have no necessary connection with populus liveing through the winter.It Masked Symptom Under High Temperature Stress.Preferable management was usabal on lightening the state of illness,but it couldn’t be cured completely.There was no rules ont planting situation.The states of illness were worse and earlier.by investigation.The pathogeny may be relatived to the populus origin.No Disease-Resistant populus breeds were discovered.In the other tree species(e.g. platanus orientalis) the similar yellow-leaf disease were existent.