Constable Mahadev Minj was killed when his patrol party was on way to sanitise a helipad under Bheji police station area of Sukma district, security sources said.
Minj and his party from the 2nd battalion of the CRPF were ambushed with heavy fire while cordoning off the helipad, they said.
Two other troopers of the force were injured in the firing and they have been admitted to a hospital in Jagdalpur.
All the troopers sustained bullet injuries.
The helicopter, which was on way to the helipad to bring in rations for the troops, was not damaged, they said.