Abstract: An ecologic problem worth to be attached great importance——to protect the withered grass and litter in urban and rural areas is pat forward by the author. The author considers that good soil is the state wealth, and humus is the prerequisite of good soil. Therefore, to protect withered grass and litter, the source of humus, is as important as to protect soil.

Key words: Plant granules, Oncomelania hupensis, Poison effect