Pro+tectree is a functional tree stake that strengthens the maintenance of street trees. Its concept is to improve the tree stake that needs to be installed after the tree is transplanted. The sensor is installed on the support inserted into the soil to measure the soil moisture. It is combined with solar water sprinkler to water the tree, and the upper water tank is regularly stored by the maintenance personnel to maintain the survival of the tree. It can also be filled with rooting liquid or fertilizer, which can reduce the labor cost of maintenance and greatly improve the survival rate.