"There is only one earth" is a resounding slogan put forward by 1972 at the human environment conference held in Stockholm, Sweden. Based on this topic, this paper introduces the relevant knowledge of the earth from the perspective of human survival, clarifies the fact that there is only one earth for human survival, and calls on human beings to cherish resources and protect the earth. The text has distinct layers and clear context. First of all, the introduction of the earth begins with the scene of astronauts watching the earth in space. Then, from the small size of the earth in the universe, the limited natural resources it has, and the uncontrolled exploitation or random destruction, it shows that the earth is facing the threat of resource depletion. Then it is proved by the research results of scientists that when the earth's resources are exhausted, human beings can't move to the second suitable planet at present; Finally, tell readers that human beings should carefully protect the earth and its ecological environment. The text introduces all kinds of knowledge of the earth scientifically and effectively explains the fact that there is only one earth by enumerating numbers and giving examples. Strict wording and vivid expression are the main characteristics of this language. At the same time, metaphors and personification are used in many places, which reflects the vividness of the language of scientific papers. The full text is scientific, artistic and ideological. While introducing scientific knowledge, it can stimulate readers' emotions and enlighten readers' thoughts. The purpose of writing this text is to guide students to master the main content, understand the relevant knowledge of the earth, and understand that there is only one earth for human existence; The second is to guide students to learn the method of "connecting with reality and thinking deeply", deepen their understanding of the text and stimulate their feelings of cherishing resources and protecting the earth; The third is to guide students to understand the accuracy of the words used in the article and the interpretation methods of the article. The focus of this lesson is to understand that human beings have only one earth, cherish resources and protect the ecological environment of the earth. The difficulty is to deepen the understanding of the text and put the consciousness of protecting the earth into action by thinking about the problem in connection with reality.