In the biosphere, the largest ecosystem on the earth, the population is very large, with different shapes, complex structures and colorful life phenomena, which fully embodies the biodiversity of organisms. Taken together, biodiversity includes genetic diversity, species diversity and ecosystem diversity. Humans live in such an environment, and colorful creatures have become precious wealth for human survival. However, due to human influence, biodiversity is seriously threatened. Human beings should protect biodiversity, that is, protect the environment on which human beings depend. Each component of the biological community in the ecosystem has its position and function in the ecosystem. Some are producers, some are consumers, and some are decomposers, and each has its own responsibilities. Biodiversity has many important values for human beings as consumers. Ask the students to think, what is the value of biodiversity to human beings? From the point of view of ecosystem, there will be direct, indirect, near or far relationship between the components of ecosystem, which makes biodiversity have direct or indirect use value for human beings. Some creatures may not see any use value at present, but after a period of time, they can still show use value and have potential use value. There are many animals and plants in high school biology, which are important medicinal materials and have direct utilization value. Such as snakes, scorpions, seabirds, trogopterori, cuttlebone, cicada slough, etc. (showing videos or pictures of animal medicinal materials) directly used as medicine. There are many kinds of plants that can be used as medicinal materials. Such as ginseng, Eucommia ulmoides, astragalus, angelica, Hedysarum, Lobelia chinensis, Lygodium japonicum, Pteris multifida and so on. In addition, many organisms are important industrial raw materials. Such as cotton, chicory, rubber grass, etc. With the development of science and technology, the gene of one population is grafted into another organism by genetic engineering to produce a new species, which makes the gene have direct use value. For example, scientists have found that some plants have insect-resistant genes. In organisms with insect-resistant genes, cells can produce a substance that pests don't like to eat, showing insect-resistant characteristics. People grafted this insect-resistant gene into cotton cells to produce insect-resistant cotton. This shows that genes also have direct use value. Some creatures may not have direct use value, but they have indirect use value. This is because biodiversity has important ecological functions. Every living thing has a certain position in the ecosystem, and there are interdependent and restrictive relationships among different living things. In an ecosystem, the decline of a species will affect the stability of each component of the ecosystem. This fully embodies the indirect use value of biology. Some creatures seem to have no use value. But with the development of science and technology, these creatures that have no use value at present will still have use value, which is the so-called potential use value. China has a vast territory, spanning tropical, subtropical, temperate and frigid zones. There are different ecosystems, extremely rich biological species, diverse ecosystems and different genetic characteristics. What are the characteristics of biodiversity in China? China's biodiversity has four characteristics: First, it is rich in species. The number of vertebrates in China accounts for about 14% of the total number of vertebrates in the world. There are more than 30,000 species of plants with more than * * * on the bridge, and China has one of the largest bird species in the world. Secondly, there are many unique and ancient species in China. Because China has a vast territory and diverse geological landforms, Quaternary glaciers have little influence on China, which makes China retain some ancient species selected in the case of general innovative teaching design unique to the new curriculum standard in China, such as giant panda, baiji, ginkgo, fire fir and so on. Third, China is rich in wildlife resources and economic species. Fourthly, China's ecosystem is diverse. Although China's biodiversity has so many characteristics, it is also seriously threatened. First of all, species diversity and genetic diversity are threatened, and the global extinction rate is accelerating. Some species in China have been extinct or endangered, and Xinjiang tigers and wild horses have been extinct or extinct in China. The diversity of China's ecosystem is also decreasing sharply, which is seriously threatened. The causes of these problems are mainly human factors, which are manifested in four aspects: First, the change and destruction of the living environment. Second, predatory development and utilization. Third, environmental pollution. Fourth, the invasion of alien species. In view of the existing problems of biodiversity, it is necessary to protect biodiversity. In-situ protection refers to the protection of biodiversity, the protection of certain areas including protected objects in the form of law, and the establishment of nature reserves. Some nature reserves are designed to protect some endangered species; Some nature reserves are designed to protect certain natural ecosystems. Ex-situ conservation means that some creatures have no living conditions in their habitats, or it is difficult to find a mate in their habitats, and these creatures are moved out of their original habitats and moved into zoos, botanical gardens and aquariums with better conditions for special protection and management. Ex situ conservation is an important supplement to in situ conservation. In addition, education and legal management should be strengthened.