The purity and granularity of the salt product is relative and it also important to the salt enterprise. This paper expatiates the control of granularity according design and operation.

• 提高盐产品的纯度和粒度是相互关联的；也是制盐企业追求的；文章从结晶的机理着手；从设计和操作两方面阐述如何控制盐品粒度.