With the increased production of seawater desalination，issues about the drainage of brine.after seawater desalination have attracted extensive concern day by day.At present，the brine discharged from seawater desalination projects is almost poured into sea directly，which not only causes the marine environmental pollution，such as the unexpected rising of the seawater salt degree which brings on the death of fish，alga，and the worsens of ecological environment gradually；but also esults in a enormous waste of resource if drained directly not by utilizing.To herein，according to present research situation of seawater utilization all over the world，we propound the combined technology of seawater desalination coupled with extracting potassium，lithium and bromine from the discharged brine separately，and making use of brine as working medium for solar pond，which generates electricity to supply desalination system，thereby forms an effective cycle of whole seawater utilization.Through the above mentioned methods，it can not only improve the drainage of discharged brine，but also reduce costs of desalinization by assistant techniques.