HSBC's chief China economist Qu Hongbin said the reading improved thanks to "broad-based modest improvements," which imply that the recovery is consolidating.
"This momentum is likely to continue in the coming months, creating favorable conditions for speeding up structural reforms," Qu said.
China's communist leaders are scheduled to meet in November to draw up a blueprint for economic development.
The country's leaders have said their priority is longer-term reforms aimed at guiding the economy to slower, more sustainable growth based on domestic consumption rather than exports and investment. Reform advocates hope the blueprint will include measures to open up its markets and provide more financial support to private entrepreneurs.
The full version of HSBC's survey will be released Nov. 1.