In late 2005, it was widely discussed in the field of international biomedical research that Seoul National University Professor Hwang Woo-Su fraudulently reported to have succeeded in creating human embryonic stem cells by cloning. This article explains why the process of obtaining embryonic stem cell by Somatic Cell Nuclear Transfer (i.e. therapeutic cloning) deserves public attentions. Following the description of the relevant international regulations, this article delves into the legal status of embryo in the constitution in Taiwan. At the end, this article concludes that embryo is protected by the constitutional right to life, but embryo has not been an object of right of human dignity. On this basis, this article discusses various sources of embryo and makes a number of suggestions to legislation.