This issue involves complex issues at multiple levels, including science, ethics, and law. At present, in theory, genetic engineering technologies (such as CRISPR-Cas9) have shown high precision in some areas, making it possible to edit genes, such as somatic cell gene therapy for the treatment of genetic diseases. But there are several key points to consider: 1. The current state of science and technology: Current gene editing technology is mainly applied to somatic cells, that is, therapeutic modifications to adult individuals or acquired cells, rather than irreversible whole-genome modifications to germ cells or embryos. The idea of creating a "new human variant" involves large-scale adjustments to embryos or entire gene combinations, which is far beyond the current controllable and safe experimental scope. Even if there may be technological advances in the future, its complexity and unforeseen consequences make the scientific community cautious about this. 2. Ethical and legal issues: Using genetic engineering to create a completely new human variant involves extremely serious ethical disputes. Many international ethical guidelines and laws explicitly prohibit or strictly restrict gene editing of human embryos, especially when it comes to modifications to germ cells or embryos. Such research will not only bring unpredictable health risks, but may also lead to a series of social, ethical and legal issues, such as "designer babies" and social inequality. Therefore, most countries and scientific research institutions will strictly regulate such research, or even completely ban it. 3. The needs and risks of medical research: The goal of medical research is usually to cure diseases, prolong life and improve the quality of life, rather than to create a completely new human variant. Existing medical research can already be explored in animal models, human cells and within the framework of safe clinical trials. A lot of resources and energy are invested in how to use existing technologies to treat diseases rather than creating a completely new human form. Creating new human variants not only has technically unpredictable problems, but may also lead to ethical and safety risks. Once an unexpected crisis occurs, the consequences will be difficult to control. In summary, although gene editing technology is constantly improving, using genetic engineering to create a "new human variant suitable for medical research" is currently technically out of reach, and it faces great controversy and resistance at the ethical, social and legal levels. At this stage, the scientific community generally advocates conducting research under the premise of ensuring safety and complying with ethics, rather than pursuing radical experiments that may cause major risks and uncontrollable consequences.