Identification and recognition of incomplete embryo is a new matter which has been raised recently. But rapid development of technology and recognition of prenatal disorders made abortion a means to relive and to prevent a child with untreatable and dangerous diseases from having a hard life. But some people are involved in it and it has created many social disorders. Although many religious jurisprudents believe that abortion is unlawful, if embryo has developed a fatal and untreatable disease, is abortion lawful? What is the opinion of jurisprudents considering abortion before and after blowing the soul? The research method on this issue is to collect the opinions of abortion cons and pros and to discuss and investigate their proofs. Considering jurisprudential studies and investigations, Sunni jurisprudents regard incomplete abortion before blowing the soul lawful. Majority of Imamite jurisprudents have the same opinion in this regard. On the other hand, all Sunni and Imamite jurisprudents regard abortion after blowing the soul unlawful, even though the embryo has an untreatable disease.