Abstract: The growth and the development of Commelina communis L and its biological characteristics and pesticide prevention and control were studied in this paper. The seeding emergence occurs in the middle of May,while its peak emergence is in the end of the month.The peak period of the vegetative growth is in the end of July. The depth of 5cm from the seeds to the soil surface is favorable for the seed emergence, and no seed emergence was investigated in the depth of 20cm.By mean of sieving exporiment,the Best treatment soil agent of competition Commelina Communis L is 72% Dual and 36% Nongcaojing ,the best treatment agent of leaf surface is 48% Command and 24% Cobra , meanwhile making alargee scale experiments and demonstrations.