The invention discloses a partial base deletion 
muscle inhibin 
gene capable of being expressed in a mouse and application. An MSTN 
gene comprises two introns and three 
exon subsequence. 6 bases are deleted at the 175th-180th bit of the third 
exon are deleted, a 
cutting carrier containing partial base deletion 
muscle inhibin genes is constructed, a knock-out mouse containing the partial base deletion 
muscle inhibin genes is prepared, the 
cutting carrier containing the partial base deletion muscle inhibin genes is applied to MSTN 
organism character researches, the muscle amount of mouse 
skeletal muscle is increased, a double muscling phenomenon is generated, and the mouse 
basal metabolic rate and mouse body temperature are reduced. Through a 
genetic engineering method, base knock-out is performed on the original MSTN 
gene of the mouse, normal physiological functions of the 
organism are not affected while the muscle amount of the mouse 
skeletal muscle is increased, the muscle amount of the mouse can be quickly improved, and the partial base deletion muscle inhibin gene has large application prospect.