当单调函数的反函数不能显性表示时，连续型随机变量的分布密度曲线仍可通过参数方程的形式获得。

When a inverse function of monotone function can not show the explicit formula, the distribution density curve of continuous randon variable can be gained with a parametric equation.

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利用特殊函数的性质，较详细地分析了F分布密度函数之性质，指出了第二个参数的变化对密度曲线的影响。

This paper uses the properties of special functions, analyses properties of F distributed density function in detail, points out the effects of change of the second parameter on density curve.

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