Analyzing the genotype of individuals for which blood relations are to be determined based on the marker (A); Inputting genotyping result data as a result of step (a) (b); Inputting the allele frequency from the data of the genotyping result of step (b) (c); Comparing whether or not allelic types are matched between individuals whose blood relationship is to be determined, and setting an IBD formula according to the number of matching cases of the allele, and IBD according to the number of cases related to blood relationship in the set IBD formula Extracting a likelihood ratio by applying a constant (D); By providing a blood relationship analysis method using genotype analysis consisting of the step (E) of determining the blood relationship by checking the highest probability result of step (D), analysis can be performed in a short time due to the simplification of the analysis process. The accuracy, efficiency, simplicity, and professionalism of work are improved, and furthermore, accurate results can be provided in household identification, selection breeding, and discharge effect investigation (sibling relationship analysis for discharged seeds).
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