Trade resumed Wednesday at Tan Thanh Border Gate in the northern province of Lang Son after customs officials of both countries agreed on Covid-19 safety measures.
There are over 1,000 trucks stuck at the gate and another major gate in the same province, Huu Nghi, said Nong Hai Thang, director of border gate management in Lang Son.
"Trucks need to wait two days to pass the gate."
The delay is caused by China imposing more stringent examinations on vehicles and products to prevent Covid-19 contagion.
There are 12 big and small border gates in Lang Son.
Vietnam has recorded nearly 290,000 Covid-19 cases since the end of April.
China was Vietnam's second largest export market in the first seven months with a value of $28.7 billion, up 24 percent year-on-year, according to the General Statistics Office.