Dempster-Shafer　evidence　theory　based　on　interval-valued　belief　structures　has　wide　application　prospect　in　the　fields　of　information　fusion　and　decision　analysis.　To　suppress　the　counterintuitive　results　generated　from　the　combination　of　conflicting　interval-valued　belief　structures,　a　modified　evidence　combination　approach　is　proposed.　An　optimization　model　of　pianistic　probability　distance　is　built　from　the　global　perspective　to　provide　the　relative　importance　weights　for　weighting　evidence　such　that　the　weighted　evidence　can　be　reasonably　combined　with　the　Dempster　rule　of　combination.　Numerical　examples　show　the　efficiency　and　rationality　of　the　proposed　approach.