Using the approach of partial differential equation and working in the framework of Black-Scholes,we find the formula to price fixed deposit in a simplified case in which we approximate the American-style option by Bermudan option.

• 在Black-Scholes框架下；采用均值回复的Vasicek利率模型和偏微分方程的方法；用百慕大期权来近似；给出了定期存款的定价公式.