Pregnant women can pass the subway security, subway security checks mainly use portable detectors, detection inspection doors and luggage X-ray security screening device, pregnant women and fetuses generally no significant impact. 1, portable detectors: security personnel portable detectors, also known as magnetic detectors, can be transmitted through molecular resonance and ultra-low frequency, such metal detectors radiation effect is small, usually pregnant women and fetuses do not cause; 2, detection Check the door: mainly used for physical examination of pregnant women to see if they carry guns, knives and other prohibited items, and detection check the door mainly through the principle of electromagnetic transformation of metal detection, and no X-ray radiation, so usually pregnant women and fetuses are not affected; 3, luggage X-ray security device: this equipment is usually used for luggage inspection, so the imaging requirements are lower, so compared with medical X-ray inspection of its radiation intensity is smaller Small. In addition, the luggage X-ray screening device around the use of a certain thickness of lead plate shielding, while the luggage screening channel also uses lead curtains to shield, so X-ray rays usually do not affect the mother and fetus, but pregnant women should pay attention to avoid directly reaching out to the lead curtain to pick up luggage. During pregnancy, especially in the first three months, when the fetal central nervous system is forming, X-ray examinations should be avoided except when necessary, and should be kept away from places that suggest the presence of ionizing radiation. In addition, pregnant women should also avoid direct contact with toxic substances such as pesticides, insecticides, chemicals or environments contaminated by them.