A cervical canal of 1 cm at 35 weeks of pregnancy is dangerous and prone to preterm labor. Normal full-term before the cervical canal is more than 3 cm is normal, for example, pregnancy labor, fetal position is low, originally had cervical surgery, etc. may cause early shortening of the cervical canal. Pregnancy fatigue caused frequent false contractions, which is easy to form the shortening of the cervical canal, you can apply drugs than, such as magnesium sulfate to control contractions, reduce the risk of preterm labor. Fetal position is low, for example, the position of the fetus itself is falling, close to the cervical canal, it is also easy to shorten the cervical canal, resulting in preterm labor or placenta previa, which will require absolute bed rest, quiet recuperation. The original cervical surgery caused cervical function is not good, to the second trimester of pregnancy when the pressure of the fetus is greater, it will cause premature shortening of the cervical canal, this should be absolute bed rest and regular checkups, there are abnormalities in the treatment of the symptoms. Therefore, 35 weeks pregnant cervical canal 1 cm is more dangerous, must have more rest, regular pregnancy checkups and timely intervention, in order to avoid delays in the condition.