A　common　issue　is　that　a　large　number　of　authorized　apps　use　important　and　sensitive　personal　information　without　arousing　users’　full　awareness.　Existing　schemes　for　privacy　protection　on　smartphones　try　to　provide　users　with　privacy　settings　to　control　privacy　leakage.　Privacy　settings　on　smartphone　are　intended　to　inform　users　about　risks　of　privacy　leakage　and　let　users　take　over　control　of　smartphone.　Therefore,　it　is　essential　to　understand　and　measure　how　much　users　perceive　and　trust　these　settings.　To　this　end,　we　design　and　conduct　a　fine-grained　online　survey　with　222　respondents.　We　collect　the　demographics　as　well　as　users’　smartphone　usage,　covering　not　only　participants’　basic　background　information　like　age,　gender,　job,　but　also　time　of　smartphone　use　per　day,　respective　importance　and　sensitivity　level　of　personal　data,　and　their　smartphone　OSs.　In　this　paper,　we　investigate　users’　current　privacy　perception　and　protection　on　smartphone　in　different　groups,　discussing　participants’　responses　to　(1)　Rating　the　importance　and　sensitivity　of　personal　information;　(2)　Trust　on　existing　privacy　protection;　(3)　Perceived　control　on　smartphone;　(4)　Frequency　of　searching　privacy　knowledge;　(5)　Concerns　about　manufacturer　and　third-party　company’s　behaviors　on　personal　data　and　decision.　©　2017,　Springer　International　Publishing　AG.