ChiNext Index dropped 2.39 points, or 0.24 percent, to open at 992.57 points Tuesday.

The index, officially launched on June 1, 2010 on the Shenzhen Stock Exchange, has a base value of 1,000 points.

The ChiNext Index, together with the Shenzhen Component Index and the Shenzhen SME (small and medium-sized enterprises) Board Index, makes up the three core indices reflecting the performance of China's stocks listed on the Shenzhen Stock Exchange.