The growth was well above the full-year target of 6.5 per cent, and the 6.8 per cent increase registered in the fourth quarter of 2016, China's National Bureau of Statistics said.
The GDP reached 18.07 trillion yuan (USD 2.63 trillion) in the first quarter.
The NBS statement said, "the national economy maintained the momentum of steady and sound development from the second half of last year, getting off to a good start in 2017 and laying a solid foundation for accomplishing the whole-year growth target".
China is trying to boost domestic consumption to shift focus of its export reliant economy, which is also driven by massive state investments in improving the infrastructure.
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Also, China's exports, which were on a declining trend in recent years, showed increase in Q1 in Yuan terms.
China's exports in yuan-denominated terms rose 14.8 per cent year-on-year in the first quarter, while imports increased 31.1 per cent, customs data released on April 13 said.
Foreign trade volume reached 6.2 trillion yuan (about USD 902 billion) in the first quarter, up 21.8 per cent year on year.
FAI includes capital spent on infrastructure, property, machinery and other physical assets.
Private sector FAI, which accounts for more than 60 percent of the total FAI, grew 7.7 per cent in the first quarter, accelerating from the 6. 7 per cent registered in the first two months, according to the NBS.
FAI by state-owned enterprises climbed 13.6 per cent year on year during the period, and infrastructure investment expanded 23.5 per cent in the first quarter.
The 6.8 per cent growth rose from the 5.8 per cent increase in the same period of 2016. It was also higher than the 6-percent annual gain seen in 2016, NBS said.
In March, industrial production expanded 7.6 per cent year on year, NBS data showed.
Spending on infrastructure, spiralling property market and increase in public debt specially the bad loans remained a key concern for Chinese leadership as it grappled to halt the slowdown of the economy which last year slid to 6.9 per cent.
On the debt front, China's total and private debt is reported to be worth more than 250 per cent of GDP.
In February this year, state-run Xinhua news agency has quoted China Banking Association as saying that the country's bad loans totalled to a whopping USD 220 billion last year.
Bad loans by commercial banks totalled 1.5 trillion yuan (USD 220 billion) at the end of 2016.
The biggest borrower is urban infrastructure projects, followed by the medical sector, it said.
Though Chinese government has been maintaining that it will not resort to heavy stimulus package to halt slowdown of its economy, China reported to have finalised USD 6. 54 trillionFAI plans for this year.
"Stimulus plans are used to prop up weak demand with governmentinvestment under special circumstances," he said but at the same defended heavy fixed-assetinvestments(FAI) saying that they are different.
Last month, a report said plans by 23 provincial-level regions had announced FAI volume totalling some 45 trillion yuan for 2017, stoking concern of a gigantic stimulus plan.
Li said FAI volume is the aggregate rather than newly- addedinvestmentand includesinvestmentfrom the public and private sector.