Many wells are stimulated to enhancement productivity and recovery; two types of oil field stimulation procedures are typically used: hydraulic fracturing and acid fracturing. Well stimulation technology has been successful in improving hydrocarbon recovery. Hydraulic fracturing is a well stimulation technique that involves increasing the average permeability in the well's drainage area, the procedure involves injecting a fluid at a higher pressure than the formation fracture pressure into the surrounding formation to be treated, this research is based on existing hydraulic fracturing length and width models( PKN, KGD) The goal of this study is to design a hydraulic fracturing well in the Zelten dolomite formation at Sirte basin in Libya, also evaluation of the reservoir characteristics and fluid treating properties, as well as treating circumstances that have the greatest impact on fracture dimensions( length, width and height) We will be able to put up a unified design injection parameters and correct design model for fracturing future wells in this formation by researching diverse reservoirs in this formation.