Hi Yassin, how are you? I see you are quite new to a.net, so (a little late) welcome to the forums.
Several threads dealing with the accession of the 3 associates have discussed the difference between full and associate membership. I believe the conclusion reached in all said discussions is that, basically, the associate members will have limited voting ability with respect to SkyTeam decisions. For purposes of customers (including frequent fliers), I think there is no real difference.
Next flights: MEX-LAX AM 738, LAX-PVG DL 77L, SHA-PEK CA 789, PEK-PVG CA A332, PVG-ORD MU 77W, ORD-MEX AM 738