Do a good job in labor protection for female employees with special physiological cycles. Menstrual period: factories with many female workers should set up female workers' clinics for easy use. Menstrual female workers are forbidden to engage in low temperature, three or more labor intensity, two or more high-altitude operations. Married and pregnant women workers: they are not allowed to engage in operations where harmful substances such as lead, mercury, benzene, cadmium, beryllium, arsenic, cyanide, carbon monoxide, carbon disulfide, caprolactam, chloroprene, vinyl chloride, ethylene oxide, aniline and formaldehyde exceed the national hygiene standards; Operations in which radioactive substances exceed the prescribed limits; Operation of the third level physical labor intensity in the classification standard of strong physical labor. Pregnancy: Labor protection during pregnancy is the most important part of labor protection in the "Five-Year Plan", which is of great significance for protecting fetal quality and protecting maternal and infant health. The key lies in early detection of pregnancy, so that pregnant women can obtain reliable labor protection during fetal organogenesis (3 ~ 8 weeks of pregnancy). The provisions on the scope of forbidden labor for female employees stipulates the labor taboos during pregnancy, which should be strictly observed. After the pregnancy is diagnosed, it is necessary to temporarily transfer from the operations that are toxic to the embryo and the operations in which the toxic and harmful factors exceed the national health standards in production, so as to reduce the labor intensity, and the working hours should be appropriately reduced if the pregnancy reaction is severe. Pre-natal and post-natal period: Labor protection in this period is to ensure the implementation of pre-natal and post-natal leave. At present, maternity leave in China is 90 days, including prenatal 15 days. Breastfeeding: Mothers who are breastfeeding are not allowed to engage in operations that contact toxic chemicals that can be discharged from milk, and are not allowed to engage in operations where the concentrations of manganese, fluorine, bromine, methanol, organophosphorus compounds and organochlorine compounds exceed the national standards. Menopause: After female workers enter menopause, ovarian failure is often accompanied by some symptoms of endocrine disorders, so we should pay attention to the combination of work and rest. For patients diagnosed with menopausal syndrome, when they are no longer suitable for work, they should temporarily adjust their work.