1. Open your Primecoin wallet, waiting for synchronizing with network over.

2. From Help-Debug Window-Console, use  the command “setgenerate true”.

For example: setgenerate true 3

3” means that mining is limited to 3 processors. If you have a CPU with 4 cores, one will be idle.

-1” means unlimited. Mining will occupy 100% CPU.

3. Use “getmininginfo” to check your mining state.

Notice: “Primespersec” means the speed of computing primes, but it does not show all of the mining efficiency.