Abstract: An effective sequencing method, the method comprising: (1) performing first sequencing on a sequencing template on a chip surface, so as to facilitate obtaining first sequencing data by means of first newly generated sequencing strands being formed, the sequencing template being connected onto the chip surface by means of a sequencing adapter; (2) performing first blocking treatment on 3? ends of at least a portion of the first newly generated sequencing strands; and (3) performing second sequencing on the sequencing template, so as to facilitate obtaining second sequencing data by means of second newly generated sequencing strands being formed.