Legal analysis: (1) Private individuals should go through the entrustment formalities with the local judicial department for paternity testing. (2) The parties concerned must provide the originals of valid certificates such as ID card (passport), birth certificate, marriage certificate, etc., which will be copied and filed after being checked and verified by the staff of the appraisal unit, and the originals will be immediately returned to the parties concerned. (3) The parties concerned fill out the "Application for Paternity Appraisal" in their own handwriting, including the basic information of the parties concerned and the reasons for applying. If the child is young and unable to write, it can be filled in by the parents, and then confirmed by the child's handprint. (four) the paternity test unit takes photos of the parties for filing, and the photos taken together will be used for the paternity test report. (five) to collect blood samples from each party, and each person takes 2-3 ml of blood; After the blood collection is completed, the signature of the blood-collected party is required, and the party will confirm it according to the fingerprint; The parties concerned pay the paternity test fee.

legal basis: if article 173 of the civil code has any objection to the parent-child relationship and there are justified reasons, the father or mother may bring a lawsuit to the people's court to request confirmation or denial of the parent-child relationship. If there are objections to the parent-child relationship and there are justified reasons, adult children may bring a lawsuit to the people's court to request confirmation of the parent-child relationship.