Mikhail Glinka, who had a profound influence on Russian nationalist music, created two forms of Russian classical opera. The first form is the first work of Glinka as a history-hero opera, the first opera of the Americas, "Ivan Susanin". The mythology-fairytale opera form, which Glinka's opera "Ruslan and Ludmila" left the first footsteps, is the second form of Russian classical opera. Dargomyzhsky's(Alexander Sergeyevich) opera "Rusalka" is not only a work linking the above-mentioned fairy-opera forms, but also a "life style psychology opera" which was first attempted in Russian music history. Dargomyzhsky's opera "Rusalka" is based on the Luisalka, the spirit of water delivered from the Slavic mythology, and the poems of Pushkin created on the basis of it. However, the script of this opera is written directly, and Dargomyzhsky's opera "Rusalka" is shaped in opera in deformed shape without replicating the spirit of mythical water perfectly. In Slavic mythology, the common denominator of the form of the subordinate"Rusalka" refers to the dead soul of a woman found in forests, near lakes or rivers, and has suffered from unfortunate events by alive life power, absurd society or bad men Or an innocent woman who has been betrayed by love, can not go to hell after the suicide and tempt men to death. However, the shape of "Rusalka" appearing in Dargomyzhsky opera "Rusalka" is different from that of Rusalka in the Slavic mythology (there are similarities and differences). These specificities are listed below: First, the different and the Dargomyzhsky's opera "Rusalka" i reveals all the mysteries, universality and folkness which are in the story of the Rusalka 's spirit in myth. Second, "Rusalka" in the East Slavic mythology is the existence of both good and evil forms. In the Dargomisshu opera opera "Rusalka", Rusalka is an evil spirit, a vengeful incarnation who takes a prince into the water and kills him with the evil water spirit. Third, "Rusalka" in Slavic mythology is a young virgin who has fallen into the water because of her tragic love. However, Natasha, a female actor of Dargomyzhsky's opera "Rusalka", is a person who drowns while pregnant. Fourth, "Rusalka" in the East Slavic mythology is 'an ominous being who dances.' The "Rusalka" come out of the water and wait for the night on cannabis or birch branches, and when the moon comes up, many people gather together to dance. Fifth, "Rusalka" in the East Slavic mythology tempts men to death without help of the person who had a family relationship before becoming a spirit. When I compare this with the contents of the East Slavic mythology, it is transformed from the myth to the help of Rusalka from the Birch, and from the opera to the father of Natasha. Fifth, "Rusalka" in the East Slavic mythology is a virgin, but in Dargomyzhsky's opera"Rusalka", Rusalka is an evil spirits of revenge with a daughter.