Single reference genome can’t represent all information within a species. With the decline in sequencing prices and the development of long-read sequencing technologies, we can assemble more genomes within a species to construct pan genomes. Relative to the linear reference genome, genome graph is another more efficient way to storage the information. Except for the short variants (SPN /Indel), long variants (SV) also play an important role in biological process. Using long reads, SV can be accurately detected.