Water is one of the most important substances in the world. It is a crucial issue to study the dynamics of water molecules at interfaces or in the con ned systems. In recent years, the emerging magnetic resonance technique based on nitrogen-vacancy(NV) center allows us to observe nanoscale nuclear magnetic signal and temperature simultaneously. Here we succeed in measuring the nuclear magnetic resonance signals of nanoscale solid and liquid water on diamond surface, and observing the solid-liquid phase transition of these nano-water by temperature control. This work demon-strates that the nano-NMR techniques based on NV centers can probe the dynamics behavior of nanoscale materials eectively, provides a new way for studying the nanoscale con ned systems.