Foreign trade in the first seven months was three per cent lower than a year before, with exports down 1.6 per cent and imports down 4.8 per cent, figures released by General Administration of Customs (GAC) said.
Also exports and imports fell more than expected in July in view of persisting weakness in global demand following Brexit and other factors.
Exports fell by 4.4 per cent compared to a year earlier, which was a slight improvement over June's 4.8 per cent drop but still lower than analysts had been expecting.
State-run Xinhua news agency, however, said exports in yuan-denominated terms rose 2.9 per cent year on year in July, while imports fell 5.7 per cent.
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Yuan has declined by more than six per cent in the last several months after the first devaluation in September last year.
In US dollar denominated terms, exports fell to USD 184.7 billion while imports dropped to USD 132 billion. This leaves the country with a trade surplus of USD 52.31 billion for the month of July.
Export growth may stay low in the second half of the year, Liu said.
The accelerating fall in imports came amid weak commodity prices and higher comparative base from last year, but it also suggested domestic economic activity remained weak, said Jiang Chao, an analyst with Haitong Securities.
Jiang expected the exchange rate of the yuan to remain stable in short term.
"Looking forward, we expect the trade data to remain lackluster in the coming months, given our outlook of subdued momentum in global trade and China's domestic demand," Kuijs said.
The sluggish domestic demand indicates that China's efforts to boost consumption to spur growth have yet to take effect.
China's economy grew 6.7 per cent year on year in Q2, aided by infrastructure investment, a housing boom and bank lending.