The pulse of the earth explores natural ecology and reveals the harmony between man and nature; The journey of space-time in the universe appreciates the magnificence of the universe and inspires the love of science. Our planet pays attention to the earth's ecology and calls for protecting our homeland. Life tells the origin, evolution and diversity of life and shows the beauty of life. A brief history of mankind discusses the development of history and civilization and reveals the evolution of society; The string of the universe is easy to understand, introducing string theory and revealing the mystery of the universe; "Salt of the Earth" recorded photos that shocked nature and human beings. Our planet 2 continues to pay attention to the ecological environment of the earth; The Wild Spy reveals the wonderful complexity of the animal world. Time Travel 2 continues the first season and explores more mysteries of the universe. These documentaries have their own characteristics and high ornamental value, which leads to in-depth thinking about life, the universe and society.