This kit is a Unique Dual Index (UDI) connector kit designed for Illumina's second-generation sequencing platform. It is a dedicated kit for library construction. The kit includes Illumina's common library augmentation Primer Mix and 96 UDI connectors with unique tag sequences at both ends, each containing a flow cell binding site, sequencing primer binding site, and index sequence. Supports low level (>2) to high level (96) multi-sample sequencing, compatible with Illumina® double-ended and single-ended sequencing. After strict quality control and energy verification, as well as sequencing verification purity and accuracy, this kit can effectively reduce the phenomenon of sample label jumping.