Abstract: The quality of the eggshell, an important index for assessing the quality of the egg, has a great impact on the transportation, storage, processing, consumption and hatching of the egg. In this paper, the factors affecting eggshell quality, such as calcium, phosphorus, vitamins, trace elements, electrolytes, chicken age, feeding management, diseases and medicines, were elaborated in detail, and the control measures for improving eggshell quality were summarized, in hoping to provide useful information for egg producers and operators.