Optical microcavities confine light to small volumes for a long time, which significantly enhances light-matter interaction. In recent decades, higher quality factor （Q） and smaller mode volume （Vm） cavities have been fabricated, contributing a major role in various studies ranging from fundamental physics to functional photonics devices. For example, microcavity optome- chanics, which focuses on coupling an optical field and a mechanical motion, provides an ideal platform for exploring the quantum nature of macroscopic objects [1]; microcavities with deformed boundaries can act as open billiard systems to test classical and quantum chaos [2]; and microcavity-enhanced optical sensors possess ultrahigh sensitivities with the detection limit down to single nanoscale particles [3,4]. Researchers have participated extensively in both theoretical and experimental studies of microcavity photonics, and thus making the contribution of China prominent in this field of research. Based on these facts, the editorial board of SCIENCE CHINA Physics, Mechanics ＆ Astronomy has invited a series of reviews and original works for this special issue. However, because the field of ＂microcavity photonics＂, consisting of two experimental works）, is presented. of the page limitation, only a partial account of the progress made in reviews and seven original papers （three theoretical papers and
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