Assuming you’re referring to the Great Khan Encampment in Fallout: New Vegas, the best way to get there without dying is to have a high enough reputation with the Khans. If you don’t have a high enough reputation, they will likely attack you on sight.
There are a few ways to get a high reputation with the Khans. One way is to complete their quest line. Another way is to kill all the NCR troops in the Cottonwood Cove. And finally, you can also help them win the Second Battle of Hoover Dam.