In　this　paper,　we　shall　first　introduce　the　definition　of　modified　D-P　metric　for　fuzzy　set-valued　random　variables,　which　can　build　a　complete　metric　space　for　fuzzy　set-valued　random　variables.　With　the　use　of　modified　D-P　metric,　we　shall　define　the　variance　and　covariance　of　fuzzy　set-valued　random　variables　and　show　their　application　on　statistical　estimation.