Abstract: Infrasound is sound waves with frequencies ranging from 0.0001Hz to 20Hz.It widely exists in the environment where people live.It is created both in natural phenomena and in human activities.Infrasound is neither visible nor audible.However it has noticeable features such as powerful capability of piercing through objects with little attenuation in transmission.Infrasound does harm human body due to resonance.When exposed to infrasound, a person feels ill with various symptoms such as dizziness, headache, nausea, fidget, diarrhea, fatigue, being scatterbrained, etc.Even worse, it can cause lung rupture and lead to death.Infrasound can also be used as a weapon, or applied in industry and medical treatment.There is much to be done in the studies of infrasonic effects on human body.