1Introduction1 1.1Overview on necessity1 1.2Origin and development9 1.3Research content and significance18 2Proposing of similar systematology applied to safety22 2.1Basic concepts22 2.2Proposing and creating28 2.3Subject nature30 2.4Discipline branches39 3Basic models of similar systematology applied to safety42 3.1Building ideas43 3.2Mathematical description model46 3.3Similarity mechanism model55 3.4Application thinking model60 4Principles of similar systematology applied to safety65 4.1Outline65 4.2Research methods67 4.3Local harmonious principle72 4.4Information principle75 4.5Co-adaptability principle79 4.6Domination principle82 5Methodology of similar systematology applied to safety84 5.1Outline84 5.2Similarity unit87 5.3Similarity96 5.4Methods analysis100 5.5General research program105 6Practice of similar systematology applied to safety109 6.1Similar system analysis109 6.2Similar system evaluation120 6.3Similar system simulation124 6.4Similar system management128 Postscript134 References135 Appendix135 Appendix 1Idiomes about Similarity146 Appendix 2Poeries about Similarity149