As a new type of acoustic circulator, the bulk acoustic wave(BAW) circulator has the advantages of small volume, low cost and compatibility with CMOS technology, and does not need ferromagnetic materials and external bias magnetic field compared to the traditional ferrite circulator. It has a broad market prospect in modern wireless communication system. This paper describes the basic principle and structure of BAW circulator, introduces the research progress of BAW circulator at home and abroad, compares the performance of BAW circulator with different structure and modulation circuits, analyzes the PCB layout and test, and summarizes the characteristics and development direction of BAW circulator.