Abstract: The radioactive waste treatment has been brought into focus with the rapidly developing of the nuclear industry. Due to the large proportion of volume and radioactivity of radioactive water in radioactive waste, the treatment of radioactive water draws people’s attention in the process of waste minimization. This research has systematically carry out mechanism study, engineering design, device development and performance verification surround the drying-into-salt technology of high salinity radioactive water. The results show that the engineering prototype runs steadily. The speed of drying is about 6-8 L/h, and the product doesn’t contain free water. Meanwhile, the temperature of inside and surface of drum is 100 degree centigrade. The pressure inside the drum locates at 1-2 kPa. This work will provide important reference for the experimental study and device development of drying-into-salt technology of high salinity radioactive water. Also, it will be a great help to follow-up engineering application of this new technology.