The statistical characteristics of basic random variables constructed from free Brownian bridge process and bounded Brownian bridge process, and from free Langevin bridge process and bounded Langevin bridge process were investigated in detail from the numerical simulation, respectively. 分别对自由布朗桥过程和有约束布朗桥过程,自由Langevin桥过程和有约束Langevin桥过程产生的随机样本进行研究,使用数值仿真方法分析了基本随机变量的统计特性。