Number of futures contracts bought and sold = total spot value/(futures index points × multipliers per point )× β coefficient. Among them, the "futures index point × multiplier per point" in the formula is actually the value of a futures contract. As can be seen from the formula, when the total spot value and futures contract value are determined, the number of futures contracts to be bought and sold is related to the size of β coefficient, and the larger the β coefficient, the more futures contracts are needed; On the contrary, the less.