The construction of this kind of government public service, due to the risk brought by breach of contract, leads to the lack of credit, which any government does not want to see. Because this is a major event related to the long-term economic development of local governments, the possibility of non-payment and other risks is very small. Comparatively speaking, the debts due in the current market are relatively reliable, but accidents cannot be ruled out, because many governments are currently in financial difficulties and debts may be postponed.