Earth-abundant　IV-VI　semiconductor　SnSe　is　regarded　as　a　promising　thermoelectric　material　due　to　its　intrinsic　low　thermal　conductivity.　In　this　report,　the　highly　textured　SnSe/Ag2Se　composites　were　first　designed　by　solid　solution　method　followed　by　spark　plasma　sintering　(SPS)　and　their　thermoelectric　properties　in　two　directions　were　investigated,　and　then,　the　performance　of　composites　was　further　optimized　with　an　additional　ball　milling.　The　coexistence　of　SnSe　and　Ag2Se　phases　is　clearly　confirmed　by　energy-dispersive　X-ray　spectroscopy　(EDX)　in　transmission　electron　microscopy　(TEM).　After　ball　milling,　the　size　of　SnSe　grains　as　well　as　the　incorporated　Ag2Se　particles　reduces　effectively,　which　synergistically　optimizes　the　electrical　and　thermal　transport　properties　at　high　temperature　range.　As　a　result,　a　maximum　ZT　of　similar　to　0.74　at　773　K　for　SnSe　+　1.0%Ag2Se　in　the　direction　vertical　to　the　pressing　direction　is　achieved.　Composite　engineering　with　additional　ball　milling　is　thus　proved　to　be　an　efficient　way　to　improve　the　thermoelectric　properties　of　SnSe,　and　this　strategy　could　be　applicable　to　other　thermoelectric　systems.