1. Agricultural production: Xuzhou No.4 Prison has a large area of farmland and greenhouses, where criminals can engage in agricultural production, including planting vegetables, fruits, grain and raising poultry and livestock. These agricultural products can be used to supply food inside the prison or sold to the external market.
2. Industrial production: Xuzhou No.4 Prison also has a number of industrial workshops, where criminals can engage in various types of industrial production, including textiles, shoes, clothing, electronics and so on. These products can be supplied to prison production and maintenance, and can also be sold to the external market.
3. Service industry: Xuzhou No.4 Prison also has a number of service departments, where criminals can engage in various services, including catering, cleaning and maintenance. These services can meet the needs of prisons and can also be provided to the external market.