Zhu Yuanzhang carried out the economic policy of health care and adopted a series of measures conducive to the recovery and development of agricultural production, such as encouraging land reclamation, implementing the system of land reclamation in the three villages of the people, the army and the merchants, building water conservancy projects, and promoting the cultivation of mulberry, hemp, cotton and other cash crops throughout the country, which successfully restored and developed the social economy of the Ming Dynasty. He also ordered the land to be cleared, compiled the Yellow Book of Gong Fish Scales, and established the system of inner armor and grain length to bind farmers' land. His policies, such as restricting and cracking down on the old landlords, stipulating the shift system of craftsmen and relaxing the personal control of rival industrialists, also promoted the recovery and development of agriculture and handicraft production.