Vietnamese firms shipped just US$509-million worth of goods to China through the border, a 87 percent dive year-on-year, according to customs data.
Imports from China dropped by 52.5 percent to $3.64 billion.
China’s zero-Covid strategy and tightened control of cross-border movement have had the biggest effect on trade, the Ministry of Industry and Trade said.
Lack of transport, logistic and cross-border trade infrastructure worsened the situation, it added.
Though trading through key border gates in the northern provinces of Lao Cai and Lang Son has resumed, customs clearance has yet to return to pre-pandemic levels.
At Lang Son’s Tan Thanh Border Gate, Vietnam’s main point for fruit export to China, only 100 vehicles get customs clearance a day, a third of the pre-pandemic level.
The ministry has warned that the border congestion could escalate if no measures are taken.
China was Vietnam’s largest partner last year, with bilateral trade reaching $166 billion.
Vietnam exported $56 billion worth of goods to China, its second largest import market, last year.
Trading through the border accounted for $42 billion, 37 percent of it being Vietnamese exports.
Agricultural produce and electronics components are Vietnam’s top export items to China.