BEIJING - China's stock index futures increased on Tuesday, with the contract for February, [Hong Kong Company Formation & Registration]the most actively traded, up 2.17 percent to close at 3,437.4 points.

The March contract gained 2.33 percent to end at 3,474.2. The June contract went up 2.33 percent to end at 3,529.6. The September contract was up 2.37 percent to end at 3,557 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 either gains or declines in the market.

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