Abstract: Polymerflooding is one of the main methods to en-hance oil recovery at present in China.Its disadvantages are complex surface injection allocation process,large amount of pumps and engineering investment needed.Henan oilfield has optimized polymer injection allocation technology during the″ninth five year plan″and the achievements include:one pump versus multi-station trans-portation technology of polymer mother liquid,one pump versus multiwell polymer solution injection technology,op-timization of polymer injection technical program and se-lection of liquid servicing ways of polymer injection pumps.Optimization of polymerflooding surface injection al-location technology can largely simplify process flow,save pump duty and lower cost.