Rotation　electron　diffraction　method　was　used　to　study　the　structures　and　crystallographic　orientations　of　the　face　centered　tetragonal　structured　y-titanium　hydride　and　the　face　centered　cubic　structured　6-titanium　hydride　by　collecting　the　diffraction　information　of　the　hydrides　and　the　matrix　at　the　same　time.　It　was　found　that　the　FCC001　6-hydride　is　the　result　of　phase　transformation　caused　by　continuing　to　charge　hydrogen　into　y-hydride.　Therefore,　we　got　the　complete　map　of　the　paths　in　which　hexagonal　close-packed　titanium　transforms　to　stable　6-titanium　hydrides　with　the　increase　of　hydrogen　atoms.