How can i activate new iphone 3GS without sim card?I bought unlock iphone.Please answer me.

You can't. All GSM iPhones require a sim card be present in order to activate the phone.

Unlocked iPhone will be activated by inserting any SIM, active or inactive, and connecting in iTunes. You can even borrow for this.

As already provided:

You can't. All GSM iPhones require a sim card be present in order to activate the phone.