What is the command to check NAT from CLI of CheckPoint Firewall.

[subrun]

What is the command to check NAT from CLI of CheckPoint Firewall. ?

I have a NokiaIP380 Firewall with R65 package. 

[PhoneBoy]

R65 and IP380s are very much end of Support at this point.
There aren't any "easy" commands to determine the precise NAT rules in place (even in recent versions) from the gateway.
The installed policy from the management will easily tell you this.

If you're trying to reconstruct the rulea (e.g. because the management is no longer available), you may find enough information in $FWDIR/state to do that.
If you want to reverse-engineer the policy from active connections, you can review the contents of the connections table using fw tab -t connections -u (and you'll have to convert from hex to IP).