Microfluidics and nanofluidics investigates fluid behaviours and measures fluid properties in micro-and nano-scale

offering unique advantages of visualization

high speed and high accuracy. The recent two decades witnesses the boom of micro-and nano-fluidic technology in fluid phase behaviour studies. In this paper

we provide a comprehensive review of recent progress in studying fluid phase behaviours using micro-and nano-fluidic technology. Specifically

we focus on the research progress in phase behaviours of protein

polymer

surfactant and salt

industrial gas

and oil and gas. Microfluidic methods are mostly developed for practical purposes to compete with conventional PVT (pressure-volume-temperature) method

which suffers a series of deficiencies such as sample-and time-consuming

slow heat and mass transfer

and safety concerns associated with large sample volume. On the other hand

nanofluidic methods focus on uncovering fundamentals of nano-confinement effect on fluid phase behaviours

which exhibits high significance in science merits. At the same time

the development prospect of micro-nano flow control technology in the field of fluid phase characteristics is prospected.