This　work　investigated　the　gradient　microstructure　evolution　and　tensile　property　of　LPBF　fabricated　15-5　precipitation　hardening　stainless　steel　in　post-process　direct　ageing　(DA)　and　solution　treating　&　ageing　(STA).　The　varied　microstructures　for　austenite　and　small-sized　oxide　inclusions　at　different　sample　heights　in　the　as-built　(AB)　condition　was　generally　preserved　after　DA　treatment.　However,　austenite　was　almost　disappeared,　and　oxide　particle　grew　significantly　after　the　STA　treatment.　As　a　result,　the　tensile　property　differences　in　sample　top　and　bottom　for　AB　and　DA　conditions　did　not　occur　in　the　STA　samples.　For　the　influence　of　post-process　heat　treatment,　the　STA　condition　had　the　highest　yield　strength　due　to　the　highest　volume　fraction　of　nano-sized　Cu　precipitates.　However,　the　DA　specimen　had　the　highest　ultimate　tensile　strength　and　elongation　owing　to　the　considerable　amount　of　austenite　phase　and　associated　transformation　induced　plasticity　effect.