Hydraulic fracturing is an important technique for unconventional oil and gas reservoir. The far field measurement technology has represented by down-hole gauge, the split extending shape has been applied to the effect evaluation of hydraulic-fracture. The major factors on surface and subsurface inclined fields are studied upon hydraulic fracturing; and then the model is verified to be correct. Using rectangle crack model, a quantitative analysis of the formation and fracture parameters are carried out. Research results show: (1) The ground tilt field is sensitive to the change of azimuth and dip angle of the crack, the crack size and depth of the crack centre is not sensitive. (2) The inclination of the field is sensitive to the crack size and depth of the crack; but to the azimuth and dip angle of the crack is not sensitive. The results can be applied to optimization design of hydraulic fracturing in reservoir.