Through the stochastic discount factor model, it is easy to understand some classical problems of modern finance, such as arbitrage pricing theory and risk neutral pricing, etc.

现代金融学的许多经典问题，如套利定价原理以及风险中性定价等都可以用随机折现因子模型理解，随机折现因子模型是资产定价模型的统一框架。

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In this paper, according to the risk neutral pricing theory, the reciprocal stochastic differential equations and the general pricing formulas of the four types of cross-cur.

本文受此启发，运用风险中性定价原理，利用偏微分方程的方法，求出了四类汇率联动期权的定价公式，为实践者提供了理论上的参考价值。

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This paper is based on the theory of the risk neutral. By analyzing the property of matingale of the option price, we construct the model of the double barriers option.

本文运用期权的风险中性定价理论，通过分析资产价格过程的性质，建立了双敲出期权的数学模型。

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