The short cervical canal can sit, and the short cervical canal in the second trimester of pregnancy should be careful not to have heavy physical activities. The length of the cervical canal varies from person to person and at different times in a woman’s life. No matter which period of time it is, it is possible to sit without adverse effects on the body. If the cervical canal is found to be short in the second trimester, it is also possible to sit, and it is recommended not to be sedentary. Don’t have heavy physical activities to avoid stimulation, causing contractions, resulting in preterm labor and so on. If there is a combination of endocervical laxity and habitual miscarriage, it is recommended to perform endocervical cerclage before pregnancy or in the middle of pregnancy. Shortening of the cervix varies from week to week, basically less than 2.5cm is considered too short, especially progressive shortening, this situation should be found in a timely manner to seek professional obstetricians, timely treatment.