Chinese shares closed the morning session lower on profit taking Tuesday, the second day of the country's key economic conference.
The benchmark Shanghai Composite Index fell 1.08 percent, or 22.57 points, to 2,068.2 when the earlier session finished. The smaller Shenzhen index lost 69.42 points, or 0.92 percent, to reach 7,459.21.
The key Shanghai index went on a roller-coaster ride amid heavy trading in the morning, as many investors chose to profit from the day-earlier gain.
The combined turnover in Shanghai and Shenzhen was 85.9 billion yuan (12.5 billion U.S. dollars), more than half of a high of 156 billion yuan recorded on Monday.
In previous trading day, Chinese shares surged 3.57 percent on prospects of more stimulus policies to buttress the economy from at hree-day Central Economic Work Conference, which started on Monday.
Observers believed the three-day event would give priority to efforts to maintain the country's stable economic growth.
The Shanghai index opened almost flat on Tuesday despite another big overnight rally on Wall Street, where the Dow Jones average rose more than three percent after the U.S. President-elect Barack Obama announced a plan to launch the largest infrastructure-spending package since the 1950s.