Liquid Photonic Device, published by Science Press in June 2021, is the first book about liquid photonic device in China. Starting from the phenomena and theories of the liquid interface, various liquid driving technologies are described in detail. Then, typical liquid photonic devices such as liquid lens and liquid optical switch are introduced. Finally, the applications of liquid photonic devices in imaging and display are described briefly. This book gives a comprehensive introduction of the driving principle, design and application of liquid photonic devices. The book is a reference book for researchers and students in optical imaging, information display, micro photonic device, microfluidics and the related fields.