文中提出一种计算黑体空腔有效发射率分布的新方法——矩形区域近似法。本方法同 Bedford’s 梯形区域近似法相比,其突出特点是避开了奇点处理问题,从而使问题得到充分简化,便于推广应用。以Buckley-Sparrow’s积分方程为基础,可以计算任何轴对称黑体空腔的有效发射率分布。计算结果与用Bedford法计算结果完全相同,属于一种精确计算方法。 In this paper, a new method for calculating the effective emissivity distribution of blackbody cavity is presented - rectangular region approximation. Compared with the approximation of Bedford’s trapezoid region, this method is characterized by avoiding the problem of singular point processing, so that the problem can be sufficiently simplified and the application is promoted. Based on the Buckley-Sparrow’s integral equation, the effective emissivity distribution of any axisymmetric blackbody cavity can be calculated. The calculation result is exactly the same as that calculated by Bedford method, which belongs to a precise calculation method.