Children in difficulty are the most weak and vulnerable group in the world. This article states that the practice for the protection of children in difficulty by projects can integrate resources of relevant authorities to serve the children involved, but is subject to the risk of effects and periodicity. The built-in system can utilize the existing admin-istrative and servicing system to provide services for children in difficulty, but is vulnerable to the drawbacks of adminis-trative systems and thus is far from expectations. Therefore, we should perfect welfare system for children, establish...