China's stock market is likely to see liquidity strains as a potential flood of unlocked shares is expected to hit the market in the coming months.

In October, lock-up shares from 44 companies' initial offerings will become eligible for trading, according to data from information service provider Wind.

In the first trading week after the long holiday, lock-up period will expire for 21 companies' initial offerings.

The number is 43 for November and 56 for December, much more than the monthly average of around 30 for the first half of the year that will put the stock market under pressure.

Southwest Securities estimates 111 billion yuan (about 16.7 billion U.S. dollars) of restricted shares from initial offerings to be unlocked in October, surging 69 percent from a month earlier.

Under China's market rules, major shareholders must wait one to two years before they are permitted to sell their shares.

The benchmark Shanghai Composite Index went up 0.28 percent to 3,348.94 points at the last trading day, and the Shenzhen Component Index closed 0.51 percent higher at 11,087.19 points.