本文讨论的是坡面日照问题在实际生活中的应用。在模型假设的基础上，我们把太阳在地面上投影近似看成匀速运动，并重点对临界状态加以分析讨论：只有侧光，没有顶光的情况；只有顶光，没有侧光的情况；既有侧光又有顶光的情况。然后再从日常生活中几种常见的走向，东西，东南，南北来进行分析-This article discusses the issue of slope sun in real life applications. Based on the assumptions in the model, we projected on the ground near the sun as a uniform motion, with an emphasis on the critical state will be discussed: only preserved, there is no top-light situations　only the top light, there is no side light of the situation　both There Side light another top-light situation. And then from the daily life of several common trend of things, southeast, north and south to analyze