CCB's non-performing loan ratio fell slightly to 0.98 percent by end-Sept, down from 0.99 percent at end-June.
But in a sign the bank remains wary of a rise in bad loans, the bank set aside 9.6 billion yuan in provisions in the third quarter, up 12.1 percent from the same period last year. The increased provisioning was a key factor in the lower-than-expected bottom line.
The latest official figures for system-wide NPLs show the ratio at 0.96 at end-June, though most outside analysts believe the true ratio is higher.
CCB's net interest margins held steady at 2.71 percent in the third quarter, unchanged from the second quarter.
Margins are expected to shrink in the medium term as China pushes ahead with interest-rate liberalization, raising banks' cost of funds while increasing competition for borrowers.
(Read more: China money market rates spike, but don't panic)
In July the central bank eliminated the official lower limit on bank lending rates.
Last week it introduced a new, market-oriented lending benchmark, in the latest incremental step towards more market-based credit allocation.
Market watchers are on the lookout for further progress on liberalizing bank deposit rates at a key Communist Party meeting scheduled for next month.
CCB's loan book grew by 3.4 percent in the third quarter compared to three months earlier, a faster pace than the second quarter, defying predictions that loan growth would slow markedly as authorities focused on deleveraging to combat rising financial risks.
A severe cash crunch engineered by the central bank in late June had been interpreted as a sign that authorities wanted to trim credit growth.
(Read more: China logs best growth so far this year)
But analysts were surprised by the swift pace of new lending in recent months, as system-wide loans outstanding rose 14.5 percent year-on-year through end-September.
Many analysts said authorities appeared to loosen the credit taps again following the crunch to prevent an overly rapid slowdown in economic growth.
The surge in new credit appears to have had the desired impact, as China's economy posted real GDP growth of 7.8 percent in the third quarter, marking only the second quarter in the last 10 in which growth has accelerated.