Abstract: The invention provides an analysis method and a device for determining a haplotype of a descendant object. Particularly, the invention provides a data analysis method for determining a haplotype genetic flow, comprising the following steps: (a) providing data sets for the analysis, the data sets being data sets related to genome information; (b) performing molecular marker genotyping in the upstream and downstream regions of Y1 target sites in each of the data sets, thereby obtaining molecular marker genotyping data, wherein Y1 is a positive integer greater than or equal to 1; (c) constructing a binary genetic vector of (0, 1) for each molecular marker site upstream and downstream of each target site in each of the data sets; (d) determining a maximum likelihood estimation value L using a Hidden Markov model for each target site; (e) determining a haplotype genetic flow direction of the descendant object and the family members through a Viterbi dynamic programming algorithm.