AbstractExotic weeds have caused serious harm to crop production , orchards , lawns , natural environment and biodiversity in China. This is closely related to certain characteristics of the exotic weeds and to lack of environmental resistance. To manage exotic weeds , measures should be taken in two aspects : one is prevention of int roduction of exotic weeds , and the other is control of existing ones. In the former aspect , measures that should be taken include : 1) reinforcing plant quarantine ; 2) establishing a risk assessment system for int roduction of exotic plants , and 3) encouraging the utilization of native plant s. In the latter aspect , the following comprehensive measures should be taken : 1) cont rolling ecological dest ruction ; 2) conducting biological cont rol of exotic weeds ; 3) using economic plants as habitat displacement cont rol agent s , and 4) conducting utilization of exotic weeds.