Incentive Stock Option enterprises in developed countries has become the most effective means of encouragement, With the social development, China's domestic enterprises will be implemented graduall y equity incentive s y stem, Although onl y a small part of the company at this stage the implementation of the s y stem, and from stock options trading there is still a long wa y . In the end of the stock options transactions will be inevitable, so development of its price and the factors affecting the price is the top priorit y . BLACK and SCHOLES designed calculation of the BS model price of stock options for us, The use of implicit model calculated difference in the numerical calculation has been proven to be an efficient and accurate solution.Keywords: stock options; implicit diff erence method 1.
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