Sorry for a simple question. I'm undermining of
http://caixpool.com. I wanted to know how it worked, that is, the Caixcoin take them and undermining other currencies are converted to Caix? Also how many coins it takes to form a Caix on caix.multipool.com? help me to understand

On caixpool you mine for other coins, these are traded at some point for CAIx which then gets paid to your wallet.
Despite the notice on the caixpool homepage, payments are still not going through correctly though (don't worry, your mined coins are safe!) - I'm sure paraflux will have a look into it at some point when he gets chance! (I'll send him a PM)
Stuhlman and the CAIx team are working on a new multipool - details will be announced in the next couple of weeks.