Abstract: Gucheng oilfield Bi 124 fault block is ordinary heavy oil reservoir,layer heterogeneity is serious,oil bearing well section is long,oil bearing layers are more,oil layer thickness is thin,underground crude oil viscosity is big.After 20 years development,reservoir recovery efficiency is low,recovery velocity is low,production degree is low,comprehensive water cut is high,development effect decrease yearly.Through optimal research on polymer flooding injection and production well pattern and spacing,injection and production parameters,polymer flooding design suitable for the study reservoir have been determined,which improve the successful application of polymer flooding four technologies and effectively enhance the polymer flooding effect.