如转机不出关,不用办理法签;如出关,我记得有这样一种visa叫transit visa(http://www.diplomatie.gouv.fr/en/coming-to-france/getting-a-visa/article/what-type-of-visa-do-i-need-to):if you are transiting through an airport in france to travel to an airport outside the schengen area and you need to leave the international zone of the french airportyou may need to leave the international zone :- because you need to change airports in paris (e. roissy-cdg to orly) ;- or because your connecting flight does not leave on the same day and you need to spend the night in a hotel outside the international zone ;- or because you are transiting through an airport in france to travel by some other form of transport to another destination. : you are arriving at roissy-cdg to take the eurostar train to london. you leave the international zone to travel on to the railway station;- or for any other reason.in all these cases, you enter the schengen area, and, unless you are exempt from short-stay visa requirements, you must apply in advance for an entry and stay visa in order to transit through france