Abstract: Even though oil extraction rate in drainage area is high by adopting traditional refracturing techniques in Zhongyuan Oilfield, the lack of exploring large amount of surplus oil out of drainage area is a peculiar problem.To solve this problem, Chemical Temporary Plugging Agent is developed to produce new gap and engender laying change of proppant through making liquid change its directions in layers and making fracturing fluid enter into high-stress zone or new fractured formation.There has been an accumulative increase of oil output of 7162 tons after 11 times of field application.As a key support process for low permeability reservoir turnaround fracture technique will greatly improve the oil txtraction rate of Pucheng Oilfield.