Acceleration　measurement　is　of　great　significance　due　to　its　extensive　applications　in　military/industrial　fields.　In　recent　years,　scientists　have　been　pursuing　methods　to　improve　the　performance　of　accelerometers,　particularly　through　seeking　new　sensing　mechanisms.　Herein,　we　present　a　synchronized　oscillator-based　enhancement　approach　to　realize　a　fivefold　resolution　improvement　of　a　microelectromechanical　resonant　accelerometer.　Through　the　unidirectional　electrical　coupling　method,　we　achieved　synchronization　of　the　sensing　oscillator　of　the　microelectromechanical　resonant　accelerometer　and　an　external　reading　oscillator,　which　remarkably　enhanced　the　stability　of　the　oscillation　system　to　19.4　ppb　and　the　resolution　of　the　accelerometer　to　1.91　μg.　In　addition,　the　narrow　synchronization　bandwidth　of　conventional　synchronized　oscillators　was　discussed,　and　hence,　we　propose　a　novel　frequency　automatic　tracking　system　to　expand　the　synchronization　bandwidth　from　113　to　1246　Hz,　which　covers　the　full　acceleration　measurement　range　of　±1　g.　For　the　first　time,　we　utilized　a　unidirectional　electrical　synchronization　mechanism　to　improve　the　resolution　of　resonant　sensors.　Our　comprehensive　scheme　provides　a　general　and　powerful　solution　for　performance　enhancement　of　any　microelectromechanical　system　(MEMS)　resonant　sensor,　thereby　enabling　a　wide　spectrum　of　applications.　©　2020,　The　Author(s).