The figure, released by the National Bureau of Statistics (NBS), remained within the government's targeted range of between 6.5 and 7 per cent for 2016.
On a quarterly basis, the economy rose 1.8 per cent from the second quarter, state-run Xinhua news agency reported.
GDP expanded 6.7 per cent year on year in the first three quarters of 2016 to reach 52.997 trillion yuan (USD 7.87 trillion).
The data showed that China's industrial output expanded 6 per cent in the first three quarters of 2016, largely due to strong performance in the high-tech and equipment manufacturing sectors.
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However, the growth rate was unchanged from that in the first half of the year, NBS said.
Industrial output is used to measure the activity of large designatedenterprises with an annual turnover of at least 20 million yuan (USD 2.97 million).
The increase in the country's industrial output was largely buoyed by the fast-developing high-tech and equipment manufacturing sectors.
China's fiscal revenue also rose 4.9 per cent year on year to 1.122 trillion yuan (USD 166.65 billion) in the third quarter.
Revenue growth was up from the 1.7 per cent gain posted in August.
The central government collected 491.7 billion yuan in fiscal revenue in September, up 6.2 per cent year on year, while local governments saw fiscal revenue rise 3.8 per cent to 630.5 billion yuan.
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China's retail sales of consumer goods grew 10.4 per cent year on year in the first three quarters of the year, accelerating from the 10.3 per cent expansion in the first half of the year, on the back of robust online sales.
Total retail sales of consumer goods stood at 23.8 trillion yuan (about USD 3.54 trillion), the NBS data said.
The data showed strong consumption in rural areas, with retail sales expanding 10.9 per cent, outpacing the 10.3 per cent expansion in urban areas.
Retail sales have contributed significantly to China's economic growth as the country is shifting from an export-driven economy to a consumption and service-led one.
In the first three quarters, consumption contributed 71 per cent to China's GDP growth, up 13.3 percentage points on the same period last year, Sheng said.
Booming retail sales are behind China's stabilising economy, which grew 6.7 per cent in the first three quarters of 2016, steady with the first half of the year, and within the government's target range of between 6.5 and 7 per cent for 2016.