A total of 13 P/LP AD-inherited variants related to porphyria were screened in ChinaMAP, with 6 for HMBS, 4 for UROD, 2 for CPOX, and 1 for PPOX. The greatest number of variants was detected in HMBS, while the lowest was detected in PPOX. The carrier rates of pathogenic variants for each type of AD porphyria in the Chinese population were as follows: AIP, 1/1059 (9.445 × 10−4, 4.527 × 10−4–1.735 × 10−3); PCT, 1/1765 (5.664 × 10−4, 2.079 × 10−4–1.233 × 10−3); HCP, 1/1513 (6.611 × 10−4, 2.657 × 10−4–1.361 × 10−3); and VP, 1/10588 (9.44 × 10−5, 2.4 × 10−6–5.261 × 10−4). The gene discussed is CPOX; the disease is Alzheimer disease.