Abstract: due　to 　the　poor　geometric 　characteristics　of 　the 　ad justment 　system there　will　be　no　strictmathematical　solution 　to 　the 　three 　linear 　arra y　images 　shorter 　than 　two　baselines．thereforethewhole　route 　ad justment 　of 　three 　intersection　method　based　on　the 　equivalent 　frame 　photoefpis 　putforward 　in 　this　paper．special　measures　are 　taken 　in 　the　method　and　the 　ad justment 　is 　divided 　into 　twoste ps．first　ste pvarious 　conditions 　are 　created 　for 　normal 　equation　solution while　the　obvious　system　deformation　of 　ad justment 　course　model　is 　not 　taken 　into 　account．second 　ste pthe 　comparison 　ismade　between　the 　route　model　data　containing　lar ger 　system　deformation　and　the 　initial 　value　of 　routemodel　containing　lar ger 　accidental 　errorsand　the 　system　value　of 　route　model　can　be　attracted 　andcorrected．finall ythe 　tests 　using　simulation 　data　and　real 　image　data　are 　conducted　and　good　resultsare 　achieved．