This paper presents that the pollen in the rabbit's organs died of drowning detected by themethod of acetic anhydride destroying organic tissues method. of the 12 rabbits, the pollens werefound in the periphery pulmonary tissues of all the rabbits, in livers of six rabbits and kidneys of four.There are no significant difference of pollen amount and ratio of pollen species in lungs between threegroups examined one day, one and two weeks respcetively after drawing. It is suggested that thepollen has the characteristic of anti-decomposition. So, pollen is a reliable evidence of diagnosis of thedrowning,Besides, the vegetation condition in local area can be reflected by the pollen in sediment inwater. Therefore, this study may provide evidences to estimate the place where the drown body fallsinto the water. This method is specially applicable to diagnose drowing in the water with little diatomand other plankton.