According  to  the  signals  taken  from  sensors,  ECU  can  control  the  rotate  speed  of  water  pump  to  change  the  water  circulation  so  that  various  EGR  cooling  temperatures  are  achieved  automatically.  EGR  temperature  is  controlled  accurately  so  that  the  quantity  of  NO x    in  the  exaust  gas  is  reduced and the emission regulations is met.  The main parts of EGR electrical control cooling system was designed.  Based  on  the  heat  transfer  theory,  the  EGR  cooler  was  designed.  Based  on  the  principle  of  Hydromechanics,  Venturi  pipe  was  designed.  The  electrical  water  pump’s  type  was  selected  and  the  EGR  cooling  control  system  were  designed.  In  order  to  design  the  hardware  and  the  software  of  the  ECU