(Yicai Global) Aug. 30 -- China's major stock market indexes remained steady on Wednesday compared with the day earlier. However, today marked the third straight trading day that the two mainboard indexes hit 8-month peak during the mid-day trading sessions.

The Shanghai Composite Index closed lower, dropping 0.05 percent to 3,363.63 points, but it hit the new high of 3,376.65 points in early trading for the first time since January 2017.

The Shenzhen Component Index soared 0.48 percent to close at 10,813.93 points. China's second mainboard index hit the 10,866.36 points on Monday, the highest since December 2016.

The Growth Enterprise Index was up 0.38 percent to close at 1,838.63 points today.

In the afternoon session, the stocks of steel manufacturing and coal mining were in upswing mood, rising 4.72 percent and 2.81 percent, respectively. The stocks related to Shanghai's stated-ownership reform and Shanghai Free Trade Zone hiked 1.52 percent and 1.50 percent, respectively, maintaining their morning climb.