It has also started upgrading and widening an existing motorable road located around 10km from the standoff site.
Sources claim China is slowly deploying more troops in Doklam which could escalate the current situation.
So far, India hasn't objected to China's latest road construction.
Where is the road being upgraded?
The road being upgraded by the Chinese People's Liberation Army (PLA) doesn't face southwards towards the militarily-sensitive Jampheri Ridge.
The Doklam standoff took place because Indian troops stopped the PLA from extending the current road towards the ridge, which overlooks the Siliguri Corridor.
The latest revelation comes as both India and China maintain increased troop presence near the Sikkim-Bhutan-Tibet tri-junction despite the standoff's end.
Source: China reinforcing claim on Doklam
"China is reinforcing its claim on the Doklam territory by upgrading the road around 10-km north and east of the earlier face-off site. The PLA has been controlling the road for some years and regularly sends patrols to the area," a source told the Times of India.
Doklam comes under Bhutanese territory. India staunchly supports Bhutan over the issue.