Recently, Design-build project as delivery system public construction sector tends to be increased according to the Masterplan for promotion of construction technologies, and construction projects are increasing their complexity, variety and scale. And owner's requirements become various. Preliminary design for design eligibility judging of design-build has been designed excessively to get a good point and this tendency includes the elements which is capable of wasting the budget. Because of excessive design, owners require to apply VE study into the design development phase but in the Design-build system, VE application has not been of no effect that owners expect, owing to the characters of lum-sum contracts. The purpose of this study is to propose the plan for effective application of VE in the design development phase in order to solve the problems such as excessive design of preliminary design in the design-build project. This study established plans for VE application through investigating and analyzing VE application case and then proposed the applications in the aspect of regulations and contracts, parties participated in project, VE operation through research for verification of usefulness.