Russian literary critic Dobro Lyubov. The Kingdom of Darkness (1859) and A Light in the Kingdom of Darkness (1860) are both analytical comments on ostrovsky's creation, among which A Light in the Kingdom of Darkness is a special analysis of ostrovsky's representative tragedy Thunderstorm. In this article, Dobro Lyubov believes that Ostrovschi "has a deep understanding of Russian life and a great ability to describe the most important aspects of life keenly and vividly." In addition to "describing people's various external and business relationships, Ostrovschi is also good at visiting the depths of his soul ... and grasping his feelings." Dobro Lyubov called the world described in Ostroff's plays "dark kingdom" and pointed out that a group of proud and freedom-loving figures like katerina appeared in this "dark kingdom". They can persist in fighting for human liberation, and they would rather die than be enslaved. With extraordinary enthusiasm and interest, Dobro Lyubov correctly believed that the image of katerina reflected the excellent characteristics of the Russian people. He pointed out: "She ran to a new life, and even if she died in this impulse, she would be willing." What is death to her? She had to live in kabanov's house, and she didn't think it was life anyway. "Dobro and Lyubov compared katerina's character to a mighty river, which will break through all obstacles. Katerina's resistance shows the natural pursuit of freedom and happiness. Therefore, he thinks that katerina is "a ray of light in dark kingdom", and her death itself contains a bold challenge to the stubborn forces, which indicates the coming of a relaxing thunderstorm, which will destroy the world full of violence and deception.