In our research, we found three kinds of genetic mutation in mucinous carcinoma of the ovary which were KRAS, PIK3CA, and BRAF. The most common type was the KRAS mutation (54%) that was similar to earlier studies; 50% in Garrett’s (2001) study, 63% in Vereczkey’s (2011) study ,75% in Gurung’s (2013) study and 68.3% in Ryland’s (2015) study. This evidence concerns the gene PIK3CA and ovarian mucinous adenocarcinoma.