China\'s stock index futures opened lower on Tuesday, with the contract for settlement in February, the most actively traded, down 3 points at 2,529 points.The contract for settlement in March, opened 3.2 points lower at 2,540 points, while the contract for settlement in June opened 4 points lower at 2,562.8 points. The contract for settlement in September opened 3.8 points lower at 2,587 points. The stock-index contracts, agreements to buy or sell the Hushen 300 Index at a present value on an agreed date, are designed to allow investors to bet on and profit from either gains or declines in the market. The index futures were 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.