Second-quarter growth was seen cooling to 6.2% from a year earlier, the same as in the previous poll, from 6.4% in the first quarter. China will post its second-quarter gross domestic product (GDP) on July 15.
Most of the 72 institutions covered in the survey expect growth will remain at 6.2% for the rest of this year, compared with expectations for a tick-up to 6.3% in the previous poll.
Zhang Yiping, senior economist at Merchants Securities in Shenzhen, said he expected the U.S. tariff hike in May on $200 billion of Chinese goods to weigh on growth in the second half.
But Zhang said authorities are likely to stick to more moderate policy easing, rather than resorting to more aggressive measures.
"We expect policy this year would focus more on building a floor to underpin the economy, rather than to boost growth," he said.
So far, China's stimulus measures have been more restrained than in past downturns, which analysts attribute to fears of adding to a mountain of debt left over from past credit binges.
But the central bank governor reportedly said last month that there is "tremendous" room to adjust policy if the trade war worsens.
The full-year forecast would be nearing the lower end of the government's 2019 target range of 6-6.5%, and would mark the weakest pace of growth China has seen in 29 years.
It would also spell a further deceleration from 6.6% in 2018 and 6.8% in 2017.
Growth next year will likely cool further to 6.0%, the poll showed.
Beijing has been relying on a combination of fiscal stimulus and monetary easing to weather the current slowdown, including hundreds of billions of dollars in infrastructure spending and tax cuts for companies.
But the economy has been slow to respond, and investors fear a longer and costlier trade war between the world's two largest economies could trigger a global recession.
U.S. President Donald Trump told counterpart Xi Jinping late last month that he is putting threatened additional levies on hold as they agreed to get trade negotiations back on track. urn:newsml:reuters.com:*:nL2N24A0DR
But Washington sharply raised tariffs on $200 billion of goods from China in May, which remain in force, and no timeframe was set for the talks.
"Trade frictions would remain in the long run despite the truce reached last month. We expect the standoff to morph into more forms such as a tech war, to put further strain on China's economy," Zhang added.
Capital Economics believes China's fiscal policy will become even more supportive, which would be most likely achieved by relaxing constraints on off-budget borrowing.
"We now expect our estimates of the augmented fiscal deficit, which includes off-budget borrowing, to widen in the coming quarters and average 8% of GDP this year, up from 6.4% in 2018."
The government has announced a rise in its budget deficit to 2.8% of GDP this year from 2.6% in 2018.
MORE MEASURES EXPECTED
Analysts in the latest Reuters poll expect the People's Bank of China (PBOC) will ease policy further this year.
But they do not expect it to cut its benchmark lending rate, as it repeatedly did in past downturns.
Separately, some other China watchers have recently raised the possibility of cut in the PBOC's benchmark or one of its short-term rates if the U.S. central bank starts easing policy as soon as this month.
The PBOC has slashed banks' reserve requirement ratio (RRR) six times since early 2018 to turn around soft credit growth. It has also injected large amounts of liquidity into the financial system and guided short-term interest rates lower.
Analysts forecast two more RRR cuts of 50 basis points each in this quarter and the last quarter.
Economists expect the central bank to keep its benchmark rate unchanged at 4.35 percent through at least the end of 2020.
The poll also predicted annual consumer inflation will pick up to 2.3% in 2019, quickening from 2.1% estimate in the April survey, but below the government target of around 3%.
Data this week showed China's producer prices stalled in June while consumer price growth reached a 15-month high as supply shortages triggered by the African swine fever outbreak and extreme weather continued to push up pork and fruit prices.
(Polling by Khushboo Mittal and Anisha Sheth; Reporting by Lusha Zhang and Kevin Yao; Editing by Kim Coghill) ((LushaZhang1@thomsonreuters.com; 8610-66271276;))