The hero of the story is a young Viking named Hiccup, who lives on the island of Bok, and fights against dragons are not uncommon. When he meets and befriends a wounded dragon, his life changes completely, and Hiccup's chance to prove himself turns into a chance to change the future of the entire tribe.（第一部）

Hiccup tames the wounded dragon and befriends it. After five years, Bok Island residents' lives thoroughly infiltrated the breath of the dragon. Bok Island is now a haven where Vikings and dragons coexist peacefully. However, with growth comes responsibility. To find out, Hiccup and the loyal Toothless set off on an adventure（第二部）

Hiccup, chief of Burke Island, and Astrid create a wonderful and lively flying dragon utopia. The unexpected appearance of a female light dragon and the arrival of an unprecedented threat force Hiccup and Toothless to leave their home and travel to a hidden place they thought existed only in mythology. After discovering their true destiny, the dragon and the knight will join hands to fight desperately to protect what they hold dear.（第三部）

The film's main villain Ge Lin demon and the protagonist, one wants to kill the dragon race, using medicine and force to enslave the dragon servants, the other is convinced that humans and dragons can coexist peacefully. The two have different views, so they are on opposite sides. The result, of course, is reality. The protagonist fails to realize the coexistence of man and dragon, so that the two are separated from each other. In the end, none of our ideas will be realized, because all the factors in our lives will become the reasons that prevent us from realizing our ideals. I learned from the movie that although it is difficult and the journey is difficult, we should not give up, it is the necessary condition for our growth.