Import from MSproject

It may be possible, but it's quite complex.
Unless an integrated solution is proposed, it will be a mess...

you must get from MS-Project :
- activities
- dependencies
- resources
- affectations
- assignments
- real work
... and retrieve links between these elements, using internal id that will, of course, be different from MS-Project ones.

I would not try such a work unless a have several quiet weeks in front of me and a lot of coffee.

Actually, I'm working on Export to MS-Project, what is much more easy than what you try, but I'm getting mad getting things clean in MS-Project...

by the way, my other problem is to know in witch SQL tables all the elements from MSproject must be save!!

Many !
at leat :
- activity
- planningelement
- user
- dependency
- assignment
- work
But if you insert manually with SQL, I am 99% sure you're database will be inconsistent and won't be working anymore.
(I've been working for more than 2 years to define all the persistence framework and objects to maintain consistancy)

if I send you a MSproject exemple with a few tasks, will you be able to identify the SQL tables were informations will be write ?

No. I know MS-Porject XML format. It's a mess and there is not direct relation with Project'Or tables.

and as you take a strong coffee

Coffee will no be enough. You can order some cokaine right now !