Abstract: In this paper,experiments in the pilot test area in the southern part of Maling oil field is reviewed.The thickness,width and length of individual lens of the low permeability pay zone,Yan₁₀,are determined by correlation of longitudinal and transverse sections.Based on the principle that the length of fractures to be created by fracturing should be kept within the limit of the lens,when the thickness of the zone is known,the length of extension of fractures and the scope of fracturing are designed according to the width of the lens.In the calculation of the length of extension of fractures after fracturing,fitting of typical curves for the pressure buidlup of six fractured wells in the test area was done.It has been found that the fracture extension ranges 17-66.5 meters Iong,mostly within the lens.Fracturing efficiency is greatly improved with the increase of length of fractures(scope of fracturing).