This strain is a mouse Angptl3 gene humanized model. The mouse Angptl3 gene is replaced with the human ANGPTL3 gene sequence by gene editing technology, which expresses the human ANGPTL3 protein while retaining the signal peptide of mouse Angptl3. This model can be used to study the pathogenesis of metabolic diseases such as atherosclerosis, diabetes, and familial combined hyperlipidemia (FCH), as well as the development and screening of ANGPTL3-targeted drugs. The homozygous B6J-hANGPTL3 mice are viable and fertile.