The April figure was an improvement on an increase of 8.9 per cent in March but was still slower than a median forecast of 9.5 per cent growth in a poll of nine economists by Dow Jones Newswires.
Fixed-asset investment -- a key measure of government spending -- rose 20.6 per cent in the first four months of the year, the NBS said, slightly down from 20.9 per cent in the first quarter.
The figures are a sign that recovery is still uncertain in the world's second-largest economy, analysts said.
"This is not the start of a rally, it is a sputtering whimper as momentum continues to fade," said Ren Xianfang and Alistair Thornton, economists with research firm IHS Global Insight, in a report.
Slowing investment suggested weakness in manufacturing and infrastructure construction, they said, adding it could decelerate further as tightening measures on the housing market start to bite.
In March, they issued new rules including a capital gains tax of 20 per cent on profits from residential property sales.
Homeowners were previously taxed just one or two percent of the sale price.
With a series of economic indicators released recently, Bank of America Merrill Lynch analysts said they saw "more downside risk" to their forecast of 8.1 per cent growth in the Chinese economy.
China grew at its slowest pace in 13 years in 2012, with gross domestic product expanding 7.8 per cent in the face of weakness at home and in key overseas markets.
The official purchasing managers' index (PMI), a widely watched indicator of the health of the Chinese economy, slowed to 50.6 in April from 50.9 in March.
The consumer price index -- a main gauge of inflation -- increased by 2.4 per cent last month, lower than the official target of 3.5 per cent for 2013 and reflecting subdued domestic demand.
Chinese leaders have said expansion will slow in the next stage of the nation's development from the near-double-digit yearly rises of recent decades, as they try to retool the economy to emphasise consumer demand as the key growth driver, rather than investment and exports.
"The China story remains an unsustainable credit story, and we have seen little to suggest that the fundamentals are improving," said Ren and Thornton.
"For this to happen, we are looking for reform, not stimulus or monetary policy tweaks. And we would suggest that so far, the new administration has been long on reform rhetoric, short on reform action.
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