Rock　avalanche　disasters　in　alpine　and　gorge　regions　are　frequent　and　large　in　scale　and　cause　severe　damage.　The　movement　of　a　rock　avalanche　is　complex　and　has　not　been　fully　studied.　The　deposits　of　a　rock　avalanche　can　provide　valuable　insights　into　its　movement　process,　which　is　crucial　in　understanding　the　rock　fragmentation　mechanism　and　predicting　disaster-affected　areas.　Taking　the　Wangjiapo　rock　avalanche　in　Yunnan　Province　of　China　as　an　example,　the　size,　shape　and　distribution　characteristics　of　the　deposit　were　analyzed　based　on　field　surveys,　unmanned　aerial　vehicle　(UAV)　photography　and　image　recognition　technology.　Initially,　3062　deposited　rock　blocks　were　manually　measured　in　the　field.　Subsequently,　the　Particles/Pores　and　Cracks　Analysis　System　(PCAS)　was　employed　to　identify　11,357　rock　blocks　with　an　area　greater　than　0.1　m2　from　UAV　orthophotos.　By　comparing　the　characteristics　of　the　rock　blocks　obtained　through　image　recognition　and　manual　measurement,　the　statistical　analysis　of　UAV　aerial　imagery　combined　with　PACS　proved　feasible　in　studying　the　Wangjiapo　rock　avalanche.　The　results　showed　that　the　rock　block　movement　was　accompanied　by　fragmentation　and　sorting　processes;　furthermore,　the　roundness　increased　with　the　migration　distance.　Small　blocks　were　more　prevalent　at　the　foot　of　the　slope,　while　irregularly　shaped,　large　blocks　dominated　in　source　areas.　The　movement　of　huge　blocks　was　characterized　by　significant　potential　energy-driven　features　and　inertia　advantages,　allowing　them　to　travel　farther　than　smaller　blocks,　and　they　tended　to　be　concentrated　in　the　central　area　of　the　deposit.　Additionally,　affected　by　the　cementation　degree　of　breccia　and　the　topography,　the　blocks　in　the　eastern　and　western　deposit　areas　exhibited　different　fragmentation　and　deposition　characteristics.