Internet of things is called the third IT revolution following the computer and the internet,and now it is everywhere.The security issues of the Internet of Things(IoT)are directly related to the wide application of its system.Beginning with introducing the architecture and features of IoT security,this paper expounds several security issues of IoT that exist in the three-layer system structure,and comes up with solutions coupled with key technologies involved.Among these safety measures concerned,those in perception layer are particularly elaborated,including key management and algorithm,security routing protocol,data fusion technology,as well as authentication and access control,etc.The paper also presents the typical application and future prospect of the internet of things.