The book's Prelude paper "the calculation of the value of the socialist community" was published in 1920, and "Socialism: an analysis of economy and sociology" was published in 1922, more than one year after Soviet Russia ended wartime communism and implemented the new economic policy. The writing of this book should be in the period of Soviet Russia's wartime communism. At that time, Marxists all over the world understood planned economy as the essential feature of socialist economic system. Today, with the proposal of the concept of socialism with Chinese characteristics and the 30-year practice of China's reform and opening up, we have already walked out of our own way in practice and made innovations with the times in theory.