Compound　percussive　drilling　technology　is　a　new　method　to　improve　the　rock-breaking　efficiency　in　deep　hard　formation.　In　order　to　study　the　rock-breaking　mechanism　of　compound　impact　drilling,　the　thermal-structure　coupling　simulation　of　the　dynamic　rock-breaking　process　with　a　single　PDC　cutter　was　investigated　by　using　ABAQUS　software.　The　influence　of　impact　parameters　on　the　rock-breaking　performance　and　cutting　temperature　was　analyzed.　The　results　proved　that　the　compound　impact　load　changes　the　rock　failure　mode　and　improves　the　rock-breaking　efficiency.　Compared　with　steady　load　cutting,　the　rock　broken　volume　under　compound　impact　increased　by　7.5%,　and　the　mechanical　specific　energy　(MSE)　decreased　by　12.3%.　As　the　axial　impact　load　amplitude　increases,　the　MSE　increases　gradually.　With　an　increase　in　torsional　impact　load　amplitude　and　impact　frequency,　the　MSE　decreases　first　and　then　increases,　and　the　optimal　torsional　static　load　ratio　is　0.3,　and　the　optimal　impact　frequency　is　30　Hz.　In　addition,　the　cutting　temperature　of　the　compound　percussive　drilling　is　higher　than　that　of　the　steady　load　cutting,　and　it　increases　with　the　impact　load　amplitude　and　decreases　with　the　frequency.　For　the　three　impact　load　waveforms-sine,　triangle,　and　square　in　this　paper,　the　rock-breaking　efficiency　under　the　condition　of　sine　waveform　is　the　largest　when　the　dynamic　amplitude　of　the　pulse　force　is　fixed,　and　the　cutting　temperature　under　the　condition　of　square　waveform　is　the　highest.　Finally,　based　on　the　analysis　of　the　rock-breaking　mechanism,　a　novel　compound　percussive　drilling　tool　was　designed　and　tested　in　the　field.