Abstract: By a study of factors affecting the result of repeated fracturing of an oil well,this paper presents guidelines in the screening of wells and form-ations to be selected as targets of repeated hydrofracturing and guidlines in the design of fracturing technology.These guidilines have been improved and modified according to the experience of field practice and signigicant well stimulation results are obtained by their application.Other new ideas in the comprehensive geo-technical study presented here may be beneficial to the field practice of other oil fields.