A　hierarchical　nanosized　Ti-BEA　zeolite　was　prepared　via　a　green　steam-assisted　conversion　(SAC)　method　taking　inorganic　titanium　source　as　the　raw　material.　Neither　aluminum　source　nor　hydrofluoric　acid　was　required,　instead,　only　a　bit　of　template　agent　(TEAOH/SiO2　=　0.2)　and　2　days　period　were　sufficient,　much　less　than　that　reported　(TEAOH/SiO2　≥　0.55,　7-14　days).　Comprehensively,　the　role　of　seeds,　alkali　ions,　and　ion　exchange　on　the　physicochemical　properties　of　Ti-BEA　products　were　investigated　via　a　series　of　characterization.　Innovatively,　the　tetracoordinated　Ti　active　sites　could　be　directly　constructed　by　a　simple　ion　exchange　process　instead　of　conventional　acid　washing;　furthermore,　the　mechanism　of　ion　exchange　inducing　Ti　coordination　transformation　was　also　proposed　to　guide　other　titanosilicate　zeolites.　Excellent　Ti　active　sites,　surface　properties,　and　textural　properties　endowed　the　Ti-BEA　catalyst　with　excellent　activity　over　cyclohexene　epoxidation,　while　its　synthesis　procedure　and　cost　were　far　better　than　reported.　©　2020　The　Royal　Society　of　Chemistry.