enable client reputation function

Hi kinmun,

You must enable first logging to disk in order to see Client Reputation,

Go to Log & Report > Log Config > Log Settings. Under Logging and Archiving, enable Disk.

Then for Client Reputation,

Go to Security Profiles > Client Reputation > Threat Level Definition. Enable Client Reputation Tracking. Assign a Risk Level Value for each category, based on your traffic concerns and needs.

You can also use this documentation,

http://docs.fortinet.com/uploaded/files/1655/monitoring-your-network-using-client-reputation.pdf 

Cheers

there is no client reputation in security profiles 

I believe confusion comes from Fortinet's tinkering with settings: in 5.0, firewall policy included "client-reputation" attribute but in 5.2 it's gone and seems that threat-weight feature is applicable to all firewall policies with "utm-status" set to enable and "logtraffic" set to all.