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中文摘要：
假设公司的收入过程是一个漂移布朗运动，除此，公司还赚取利息收入．按照门槛策略，红利被分到股东手中：当资本余额低于某个固定水平时，没有红利付出；当资本余额高于这个水平时，红利以一个常数率（低于保费率）连续付出．我们取得期望折扣分红满足的一些积分-微分方程，进一步得到了它的详细表达．
英文摘要：
The income process of a company is modeled by a Brownian motion with drift, and in additions the surplus earns investment income in constant rate. Dividends are paid to the shareholders according to a threshold strategy： whenever the （modified） surplus is below some level, no dividends are paid; whenever the modified surplus is above the level, dividends are paid continuously with a constant rate （less than the premium rate）. We obtain that the expected discounted dividends satisfies some integro-differential equations, further derive its explicit expressions.
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