The defensive trademark can actively prevent utilizing the influence of the well-known trademarks to promote other products and protect the holders' profits.It can also help the consumers avoid confusing or mistaking different trademarks.However,there has been debate on the maintenance and abolishment of defensive trademarks since some countries canceled the system.Referring to Japanese defensive trademark system,the advantages and disadvantages of defensive trademark are discussed,in order to figure out the way to protect the well-known trademarks and contribute to the establishment of defensive trademark system in China.