These are convenient, reliable and fast kits for isolation and purification nucleic acid from various clinical samples, especially formalin-fixation and paraffin-embedded (FFPE) tissue specimens. It adopts innovative silica-based spin column and a special lysis buffer system for effective binding and extraction of DNA and RNA. The purified DNA and RNA have high-integrity, high-purity and stability, and are ideally suited for diagnosis and academic research.