There are two ways leading to Tibet, one is from other parts of China, the other is form Nepal.

if you are planning to enter Tibet from other places of China, you can claim for it from our local offices of your planned previous city to Tibet, e.g. Chengdu if by air, Golmud if by Qinghai-Tibet Highway.It is a must document when you are boarding the air to Tibet.

if you are planning to enter Tibet from Nepal, you can obtain the fax copy of this permit from the Chinese Embassy in Katmandu. Please allow at least 2 days to get it. After you land at Lhasa if you fly from Katmandu to Lhasa, Our guide will meet you (at the Lhasa airport if you fly from Katmandu or at the Border if you travel though friendship highway) and forward the original Permit to you.