As　one　of　the　key　issues　for　machining　path　control　of　fiber　placement　molding,　trajectory　planning　directly　influences　the　molding　accuracy　and　placement　efficiency　of　composite　structures.　To　obtain　the　machining　path　for　deal　with,　the　CATIA　numerical　control　programming　soft　is　used　to　calculate　the　fiber　placement　trajectory.　The　problem　of　poor　compatibility　between　placement　trajectory　information　and　FANUC　is　solved　by　using　the　vector　supplement　and　format　conversion　algorithm.　By　means　of　the　interpolation　algorithm,　the　delivery　points　and　the　cutting　points　are　calculated　and　combined　with　the　placement　trajectory　information　to　yield　the　complete　placement　information　and　a　short　period.　Finally,　the　fiber　placement　trajectory　method　based　on　the　CATIA　numerical　control　technology　is　tested　on　an　aircraft　door　placement　experiment　using　the　FANUC　robot　fiber　placement　equipment.　Trajectory　end　point　position　error　and　the　trajectory　distance　error　are　both　controlled　within　±0.5　mm.