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Hi Zhaojun,
In an activity analysis, the units which are assigned to the Final Energy Intensity of a demand technology are those of 'energy per unit of activity'. However, the denominator used for these units is fixed by Activity Level variable.
Ensure that the Activity Level units are set to passenger-km (which is found under the 'Transport' section of the units selector), and then select 'Liter' for your Final Energy Intensity. Notice that the 'per passenger-km' will automatically be appended to these units.
If you aren't able to find the unit 'Liter', make sure that the fuel you have selected for the branch can be expressed using liters. A common mistake is to select (accidentally) a fuel such as electricity, which cannot be quantified by liters.
Hope this helps!
Taylor