This　paper　aims　at　an　analysis　on　the　consistency　of　the　top　of　atmosphere　(TOA)　reflectance　among　GF-1　PMS2,　GF-2　PMS1　and　Landsat-8　operational　land　imager(OLI)　sensor　data　based　on　two　synchronous　image　pairs.　The　result　shows　that　TOA　reflectance　of　GF-1　PMS2　and　GF-2　PMS1　sensors　has　a　high　degree　of　agreement.　Nevertheless,　this　paper　also　finds　that　TOA　reflectance　of　either　GF-1　PMS2　or　GF-2　PMS1　data　is　less　consistent　with　that　of　Landsat-8　OLI　data,　especially　in　the　near-infrared　band.　In　general,　the　rank　of　TOA　reflectance　in　the　blue,　green　and　red　bands　of　three　sensors　data　is　as　follows:　GF-2　PMS1＞GF-1　PMS2＞Landsat-8　OLI,　while　the　relationship　in　the　near-infrared　band　is:　Landsat-8　OLI＞GF-1　PMS2＞GF-2　PMS1.　The　coversion　models　among　the　three　sensors　data　were　obtained　through　regression　analysis.　The　validation　shows　that　the　conversion　equations　can　significantly　reduce　the　difference　in　the　near-infrared　band　among　the　three　sensors.　It　is　also　found　that　when　the　image　to　be　converted　has　similar　land　cover　types　and　proportions　with　the　image　on　which　the　conversion　model　was　developed,　the　conversion　accuracy　can　be　improve.　©　2020,　Editorial　Board　of　Geomatics　and　Information　Science　of　Wuhan　University.　All　right　reserved.