BEIJING - China's stock index futures closed lower ?Friday, with the contract for May, the most actively traded, down 1.28 percent from the previous trading day to 2,631.2 points.

The June contract lost 1.33 percent to 2,636 points. The September contract shed 1.43 percent to 2,662 points, while the December contract fell 1.19 percent to 2,703 points.

The stock-index contracts, agreements to buy or sell the Hushen 300 Index at a preset value on an agreed date, are designed to allow investors to bet on and profit from both gains and declines in the market.

The index futures was launched at the China Financial Futures Exchange (CFFEX) and started trading from April 16, 2010. The CFFEX has set the base value for all the four contracts at 3,399 points.