The main source of salt in wastewater is the addition of a large amount of dissolved inorganic substances during water use and the addition of a large amount of dissolved inorganic substances in the process of wastewater treatment. The control factor of wastewater discharge in enterprises is generally based on the "comprehensive wastewater discharge standard" (GB8978-1996), and the salt free emission standard does not cause salt emissions. If the high salinity wastewater is not treated, directly drained into the river will cause damage to the river ecosystem. If it is discharged into the domestic sewage treatment plant, it will destroy the biochemical treatment system of sewage plant, even the paralysis of the treatment system. In this paper, a pilot test on salt removal in a kind of high salt wastewater project is used to communicate and discuss together.