As　a　newly　invented　parallel　kinematic　machine(PKM),　Exechon　has　found　its　potential　application　in　machining　and　assembling　industries　due　to　high　rigidity　and　high　dynamics.　To　guarantee　the　overall　performance,　the　loading　conditions　and　deflections　of　the　key　components　must　be　revealed　to　provide　basic　mechanic　data　for　component　design.　For　this　purpose,　a　kinetostatic　model　is　proposed　with　substructure　synthesis　technique.　The　Exechon　is　divided　into　a　platform　subsystem,　a　fixed　base　subsystem　and　three　limb　subsystems　according　to　its　structure.　By　modeling　the　limb　assemblage　as　a　spatial　beam　constrained　by　two　sets　of　lumped　virtual　springs　representing　the　compliances　of　revolute　joint,　universal　joint　and　spherical　joint,　the　equilibrium　equations　of　limb　subsystems　are　derived　with　fmite　element　method(FEM).　The　equilibrium　equations　of　the　platform　are　derived　with　Newton＇s　2nd　law.　By　introducing　deformation　compatibility　conditions　between　the　platform　and　limb,　the　governing　equilibrium　equations　of　the　system　are　derived　to　formulate　an　analytical　expression　for　system＇s　deflections.　The　platform＇s　elastic　displacements　and　joint　reactions　caused　by　the　gravity　are　investigated　to　show　a　strong　position-dependency　and　axis-symmetry　due　to　its　kinematic　and　structure　features.　The　proposed　kinetostatic　model　is　a　trade-off　between　the　accuracy　of　FEM　and　concision　of　analytical　method,　thus　can　predict　the　kinetostatics　throughout　the　workspace　in　a　quick　and　succinct　manner.　The　proposed　modeling　methodology　and　kinetostatic　analysis　can　be　further　expanded　to　other　PKMs　with　necessary　modifications,　providing　useful　information　for　kinematic　calibration　as　well　as　component　strength　calculations.