Naturalism. With the rapid development of natural science in the 1970s, he wrote a paper on19th century with naturalism as the theme, and established a scientific view of harmony between man and nature. The emergence of a large number of new discoveries and achievements urgently requires the use of philosophical viewpoints, thinking and methods to generalize and summarize. Accompanied by this, some natural scientists at that time were influenced by bourgeois ideological trends and metaphysical mistakes and fell into the quagmire of idealism.