In　order　to　realize　a　folder＇s　automatic　pre-position　function,　the　folding　patterns　are　classified　and　decomposed.　Based　on　the　corresponding　relationship　analysis　between　folding　patterns　and　folding　units,　a　automatic　pre-position　principle　is　discussed,　and　the　automatic　pro-position　function　software　is　developed.　The　software　can　judge　whether　a　folder　can　finish　a　desired　folding　task.　And　it　can　also　choose　the　working　folding　units　and　finish　the　folder＇s　automatic　pro-position.