The index hit its highest since February 2018 earlier in the session, as investors cheered better-than-expected manufacturing data and hopes of continued economic recovery.
The blue-chip CSI300 index fell 0.4pc, to 4,960.25, while the Shanghai Composite index slipped 0.5pc to 3,391.76, reversing earlier gains as investors booked profits.
The blue-chip CSI300 index rose 3pc to 4,823.16, its best day since July 6, while the Shanghai Composite Index gained 2.6pc to 3,358.47 points, its best session since July 20.
The blue-chip CSI300 index was down 1.5pc, with its financial sector sub-index lower by 1.63pc, the consumer staples sector down 0.41pc, the real estate index down 1.33pc.
At the close, the Shanghai Composite index was up 0.37% at 3,333.16, while the blue-chip CSI300 index ended 0.5% higher after rising 2.1% earlier in the session.