1. local government financial funds: local governments can raise funds through financial allocation and land transfer income as part of the source of funds for special bonds.

2. The project contractor's own funds: the project contractor can raise funds through self-raised funds and bank loans as a supplementary source of funds for special bonds.

3. Special bonds are a kind of local government bonds, which are mainly issued to raise funds to build a specific project. These funds are used for public welfare projects with certain income, such as land reserve, toll roads and shantytown renovation. The corresponding government funds or special income of these projects will be used to repay the principal and interest.