Abstract: A nuraierical method has been deueloped to investigate toansient wellbare heat tansfer.It is useful for hydraulic fracturing aeidizing in which the operating periods are short.The method is based on a modea proposed by Ei cknteier et al.Three improvements have been made.1.Allowauce for the loading liquid in the wellbore,which was neglected in the original model.2.A fully implicit method instead of the original explicit method is used art this paper to guarantee unecmditional stability.3.This method can be applied for three injection patterns,i.1.from tubing,from annulus and from both of them.It is more flexible and convenient for practical use.The calculation results agree well with the rxieasured data of two wells from Shengli and Daqing oil fields.