All kinds of opportunism thought are scathingly criticized in the Communist Party Monthly，especially the Second International opportunism and Zhang Dongsun's Guild Socialism. The theory and practice which deviates from the interests of proletarian in labor movement and advocates a compromise with bourgeois is criticized by the early Marxists，which is determined to safeguard Marxism proletarian revolution and proletarian dictatorship theories and meanwhile the socialism future of Chinese revolution.