Abstract：‘Longke No.12’ is a new mid-late maturing watermelon of large-fruit type，developed by crossing selfing line ‘14KH12’ as female parent and selfing line ‘14KH01’ as male parent．The plant has strong growth vigor．Its whole growth period is about 103 days and fruit developing period is about 40 days．The fruit is of oval shape．Its peel is jade green in color covered with dark green middle racks，and about 1.0 cm in thickness．Its pulp is red in color with crisp texture．The central soluble solids content is about 12.6%，and edge soluble solids content is about 10%．The single fruit weight is about 6.0 kg．It is resistant to watermelon fusarium wilt．It can yield about 64.5 t · hm-2．It is suitable for cultivation in open fields in Gansu Province or regions with similar climate conditions．
