Semicolonies are relative to complete colonies. It refers to an independent country with its own government in form. In fact, politics, economy and other social aspects are controlled and enslaved by foreign colonialism, which is a historical decline in the form of social development. Semi-feudalism is relative to a completely feudal society. It means that feudal rule and natural economy still dominate in form. In fact, the society has been gradually modernized, and the capitalist economy, politics, ideology and culture are constantly developing and growing, which is a historic progress in the form of social development. Semi-colonialism is viewed from the political status of the country, and semi-feudalism is viewed from the social and economic structure. Semi-colonialism is the cause of semi-feudalism, which is the foundation of semi-colonialism.