By bus or by private cars or hired taxis. To get to Tuensang Town one has to first reach Dimapur, which is the only city in Nagaland connected with railways and airlines.
From Dimapur you have to take a bus which cost around Rs.300 and takes 8hrs to reach. Government-operated buses are cheaper then private cars.
Maruti van and Long Jeep are good for comfortable journeys, but be careful of the steep hills and sharp turns.