This study discussed the realization aspect of palatalization shown in Eongan used by women of royal family. Regarding the Eongan used by women of royal family, there is data of 11 queens from Queen Jangnyeol to Empress SunmyeongHyo, including total 322 cases. They are distributed from the 17th century to the early 20th century. The realization rate of palatalization shown in Eongan used by women of royal family in the Joseon Dynasty was 16.54%, and the total occurrence rate of hypercorrection was 3.30%. Compared to other data, this realization rate is very low, which shows that they were conservative in palatalization. The development process of palatalization in women of royal family could be divided into stage of occurrence, stage of diffusion, and stage of completion, and the middle of the 17th century is the stage of occurrence. In the period of Queen Inseon, the palatalization appeared for the first time. The stage of diffusion of palatalization is the period of Queen Jeongsun during the mid and late 18th century. In case of Queen Jeongsun, the palatalization was evenly realized in native words and Sino-Korean words, and the aspect of hypercorrection was also shown. The stage of completion of palatalization is the period of Empress Myeongseong. The realization rate of palatalization shown in Empress Myeongseong is 71.19%. This aspect is similar to the process of diffusion in men of royal family. The language of royal family must be conservative in the process of diffusion than other data reflecting the central dialect. The language of royal family had a conservative attitude towards palatalization because the negative psychology about southern dialect and palatalization occurred in the middle class was ambivalently reflected. Compared to the diffusion process of palatalization in men of royal family, its difference is the occurrence period of palatalization. Contrary to the men of royal family, Queen Inseon probably experienced palatalization early. What should be paid attention to in relation to the realization aspect of palatalization in Eongan used by women of royal family is the education in royal family. Among the essential education for women of royal family, the writing education could be a factor that slowed down the realization of palatalization.