Saipan is part of America territory. So, you need to apply for a visa to go there.

For some specific countries citizens, you might be able to apply for an ESTA application and avoid to do the procedure of the visa. Please, check the following link to know more about your visa https://esta.cbp.dhs.gov/esta/application.html?execution=e2s1

As french passport and Chinese, it is very easy to go there.