This　paper　presents　a　composite　switching　control　(CSC)　scheme　in　discrete-time　domain　for　fast　and　precise　set-point　tracking　in　double-integrator　servo　systems　subject　to　unknown　disturbance.　The　idea　here　is　to　combine　the　proximate　time-optimal　servomechanism　(PTOS)　and　the　composite　nonlinear　feedback　(CNF)　control,　using　the　output　position　as　the　only　measurable　information　for　feedback.　The　PTOS　is　responsible　for　fast　targeting　in　servo　systems　when　the　tracking　error　is　large,　while　the　CNF　is　to　ensure　a　smooth　settling.　A　reduced-order　extended　state　observer　is　adopted　to　estimate　the　speed　signal　for　feedback　and　the　disturbance　for　compensation.　The　proposed　control　scheme　was　applied　to　a　permanent　magnet　synchronous　motor　(PMSM)　position　servo　system.　Simulation　and　experimental　results　verify　that　the　proposed　control　scheme　is　effective　in　improving　the　tracking　performance　for　a　wide　range　of　target　set-points.　©　2013　TCCT,　CAA.