The paper briefly describes several daylighting top types,introduces daylighting top joint sealants features,grading and selection,de-scribes sealants joint width,depth and shape and other design methods,and summarizes joint sealants construction matters,with a view to achieve good join sealing effect.%简述了采光顶的几种类型，对采光顶的接缝密封特点、密封胶的分级以及选用作了介绍，并对密封胶接缝宽度、深度、形状等设计方法进行了阐述，归纳总结了接缝密封胶施工的注意事项，以达到良好的接缝密封效果。
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