0_introduction Theory of Field Unification based on Canonical Gauge Principle Ⅰ . P rinciple of Field Unification and existence lo gic of elementary particle s Ⅱ . Foundation of State-constructive Field Theory Ⅲ . Quantum Gravitational Field Theory Welcome to "Unified Field Theory". This is entrance site to cover page(definition and preface). You can immediately skip to the contents by following the link below . Apart from the above, link to the entrance sites to part-Ⅰ,Ⅱ,Ⅲ, ”Additional (summary and afterword)”, "General entrance", are also available. Among the entrance sites, you can skip from any to any through the links. ● Link to contents: ( MS_word / pdf ) Cover page : def inition & preface part- Ⅰ : Principle of Field Unification and existence logic of elementary particles part- Ⅱ : Foundation of State-constructive Field Theory part- Ⅲ : Quantum Gravitational Field Theory Addi...