According to the side length of cube defined by user, the data is divided into sub-cubes by using oct-tree segmentation algorithm, then average point-to-point distance of each cube is calculated and compared, by which the density of point-cloud in each cube can be confirmed and unwanted data points can.

This paper constructs a mathematic model for the change in each generation’s genotype entropy of the selfing population with independent heterogenes,and describes a ternary tree algorithm to compute the proportion of every genotype.