The　plastic　hinge　lengths　of　beams　and　columns　are　a　critical　demand　parameter　in　the　nonlinear　analysis　of　structures　using　the　finite　element　method.　The　numerical　model　of　a　plastic　hinge　plays　an　important　role　in　evaluating　the　response　and　damage　of　a　structure　to　earthquakes　or　other　loads　causing　the　formation　of　plastic　hinges.　Previous　research　demonstrates　that　the　plastic　hinge　length　of　reinforced　concrete　(RC)　columns　is　closely　related　to　section　size,　reinforcement　ratio,　reinforcement　strength,　concrete　strength,　axial　compression　ratio,　and　so　on.　However,　because　of　the　limitations　of　testing　facilities,　there　is　a　lack　of　experimental　data　on　columns　with　large　section　sizes　and　high　axial　compression　ratios.　In　this　work,　we　conducted　a　series　of　quasi-static　tests　for　columns　with　large　section　sizes　(up　to　700　mm)　and　high　axial　compression　ratios　(up　to　0.6)　to　explore　the　propagation　of　plastic　hinge　length　during　the　whole　loading　process.　The　experimental　results　show　that　besides　these　parameters　mentioned　in　previous　work,　the　plastic　hinge　of　RC　columns　is　also　affected　by　loading　amplitude　and　size　effect.　Therefore,　an　approach　toward　considering　the　effect　of　these　two　parameters　is　discussed　in　this　work.