The microbend fiber optic sensor is one kind of intensity modulation sensors.It utilizes intensity loss resulting from optical fiber bending to measure change of environmental parameters

such as pressure

temperature

acceleration

strain

flow

and speed.The principle and characteristics of the microbend fiber optic sensor are simply introduced.The development and practical applications of these sensors

domestic and abroad

are discussed in detail.Finally

the limitation of the microbend fiber optic sensor is analysed.