Abstract: According to geological features in Hongnan oilfield,reservoir numerical simulation method is applied tocorrelate and analyze the recovery effects by using horizontal well and vertical well in lower oil measure in Cretaceousreservoir.The results have been used to make the geologic design and productivity analysis of horizontal well along withits reasonable productivity determinations. By comparison with production peformance data,it is indicated that em-ploying horizontal well to reservoirs with bottom water is of better development effectiveness,and the determined resultfor productivity of horizontal wells is creditable and the technology is feasible.