The country's gross domestic product grew by 6.2% in the quarter ended in June, the slowest quarterly growth rate since 1992 and a decrease of 6.4% in the previous quarter, according to government figures released on Monday.
And China's economy will continue to face "downward pressure" in the second half of this year, the country's National Bureau of Statistics said in a statement.
"The Chinese economy is still in a complex and serious situation," he said. "Global growth has slowed and external uncertainties are increasing."
"The uncertainty caused by the trade war between the United States and China was an important factor and we believe that this will persist," said Tom Rafferty, China's chief economist at The Economist Intelligence Unit.
"Companies are skeptical that the two countries reach a broader trade agreement and recognize that trade tensions can rise again," he added.
"While the PBOC has already provided encouragement this year, markets are waiting for … additional measures, which will likely occur if trade negotiations collapse." He said Edward Moya, senior market badyst in Oanda. "If the conversations progress constantly, we will still see the [bank] offer new stimuli after the Fed's anticipated rate cut at the end of the month. "
Nanlin Fang contributed to this report.