ChiNext stocks declined 0.39 percent to open at 1137.08 points on Thursday.
The index, officially launched on June 1 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.
