关键词: 模糊数学, 立交匝道, 线形单元, 曲线组合线形

Abstract: Applying the conceptions and principles of fuzzy mathematics to the alignment design of interchange ramp，the circle curve and relaxation curve was considered as align ment units which constitute interchange alignment.The driving condition，align ment geometry，superelevation and fuzziness of the factors that influenced the determination of the parameters were considered too．A fuzzy optimization design method is put forward which is more reasonable than traditional design methods.The fuzzy optimization model and its solution are estabhshed．

Key words: Nzzy mathematics, interchange ramp, align ment unit, curve composing alignment