The book of the famous Russian Sinologist-historian V.N. Usov "Soviet intelligence in China: 30s of the XX century" is a continuation of his first monograph "Soviet intelligence in China in the 20s of the XX century," published in Moscow in 2002 and translated into Chinese in the PRC. This work is the first original study in Russia that tells about the activities of Soviet foreign intelligence in the person of employees of the Comintern, GRU and OGPU against the wide historical background of China at that time.