It is found that the distribution of Human Y chromosome relative length (Y/F) is different obviously within different ethnic and population. There are disputations on the relationship of Y/F with height and reproduction. By measuring the Y/F and height of 106 case (53 pairs of fathers and sons) of Fujian she ethnic, we can find that the Y chromosome relative length of Fujian she ethnic has plumb inheritance within pedigree and the appearance rate of long Y is 11.1%, below the medium level.