Black Diamond (BD) is gaining popularity as a low k dielectric for copper/low k integration. However, because of lower hardness and more hydrophobic in nature of BD film surface comparing with those of the conventional oxide, some specific defects appear during CMP process of Cu/BD patterned wafers. In this study, the patterned wafer inspection systems, AIT II, and SEM review station are used to review and to classify such defects generated from CMP process. Using conventional Cu/Oxide CMP process, the percentage of these specific defects from Cu/BD CMP is typically more than 60 of total defect count. By modifying the composition of slurry with new additives and optimization of polishing and cleaning parameters, the total defect count can be reduced by 80%, in which the amount of specific defects is less than 5% of total defect count.