【摘要】 本文进一步讨论了文献所给出的布朗运动模型的最佳时机的选择问题，并用随机游动模型作为有趋势布朗运动的近似，给出了对应随机模型的最佳时机，其思想方法是有实际意义的．更多还原

【Abstract】 This paper dicusses further the choice of the optimal time of a Brownian motion put by artical[1].The iptimal time of a Brownian motion with drift which is approximated by the random walks is discussed again and the optimal time is given.The method of this paper is useful to solving some practical problems.更多还原