VisualBasicisanobject-orientedprogramminglanguage,itissimpletounderstandandconvenienttooperate,itissimpleandpracticaltowritesomesmallmeasurementprogramswithit.Thisarticlefirstintroducesthecalculationmethodofhighwaycurvesegmentcoordinate,thenpresenttheneededwidenparameterswhenconsideringtheroadwidening,andhowtorealizetheroadwidening,andalsoestablishesthemathematicalmodelaccordingtothecalculationformula,byusingVBtodesignthecalculationprogramofloftingcoordinatewhenconsideringtheroadwidening.Atthesametime,thisarticleanalysesandintroducesthecompliedprogramming,putsforwardsomeadvantagesandtheexistingproblems.