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Internet of things is closely related to numerous fields.The present study first analyzes basic concepts and features of Internet of things based on broad and narrow sense.Then, six aspects of security issues about Internet of things are introduced from the perspective of technology and application, as well as the present security-level architecture and security-technology architecture for Internet of things.Furthermore, the key technologies of Internet of things are summarized in the section.Finally, research status of security issues about Internet of things is concluded and several development proposals are suggested for the research of security issues based on Internet of things.