With the rapid development of Internet of Things （IoT） and industrial Internet， the research of cyberspace security has been paid more and more attention by industry and academia. Because the source code cannot be obtained， binary code similarity search has become a key core technology for vulnerability mining and malware code analysis. Firstly， the basic concepts of binary code similarity search and the framework of binary code similarity search system were introduced. Secondly， the development status of binary code technology about syntax similarity search， semantic similarity search and pragmatic similarity search were discussed. Then， the existing solutions were summarized and compared from the perspectives of binary hash， instruction sequence， graph structure， basic block semantics， feature learning， debugging information recovery and advanced semantic recognition of functions. Finally， the future development direction and prospect of binary code similarity search were looked forward to.