ABSTRACT The valuation of multi-pound option and path-dependent option is the important problem in current financial engineering research. Only in some simple situations the closed-form solution for multi-pound option can be derived. Furthermore, there often exists high-dimension nested integral in the closed-form solution, which always costs puting resource and limits the development in the theoretical model and application of multi-pound option. Compared with the option without path-dependent feature, the multiple state variables in the pricing model of path-dependent option bring the soluting difficulty and make it hard to reflect the impact plex path-dependent features on option value. This paper extends the theoretical model and application scope of multi-stage compound option and path-dependent option using Finite Difference Method and Finite Element Method. This paper proposes the variable volatilities multi-pound real option model and gives its application on venture capital investment valuation; pound option pricing model of convertiable bond; discusses the properties and pricing methods of Parisian option, one kind of path-dependent option, and proposes the half-implicit Finite Difference Method to improve the bad accuracy of the explicit Finite Difference Method, and proves that this method is consistent; presents a pricing model of convertible bond with the soft constraint and notice period constraint call provision, which can reflect the the American and Parisian feature of convertible bond; performs an empirical analysis on convertible bonds of panies in China under different scenarios. The result shows that the Finite Difference Method and Finite Element Method have significant advantage on the accuracy, effiency and stability when applied in option valuation; that the variable volatilities multi-pound real option model can give more reasonable valuation of venture capital investment and the optima