The classification of labor force abnormalities includes weak uterine contractions and strong uterine contractions. 1. Weakness of uterine contraction: it is divided into coordinated and uncoordinated, among which coordinated uterine contraction is more common, and the causes are usually due to abnormal fetal position, cephalopelvic disproportion, maternal fatigue, etc. In the clinic, the contraction remains rhythmic, symmetrical and polarized. Clinical contractions remain rhythmic, symmetrical and polarized, only weak and feeble contractions, with short duration and long and irregular intervals; the latter is more common in nervous primigravid women. 2. Excessive uterine contraction: it means that the intensity and duration of pressure in the uterine cavity exceeds the normal value, and the duration of relaxation is shorter, leading to rapid labor, spasmodic contraction ring, and tonic uterine contraction, etc., and the formation of pathologic contraction ring can even lead to rupture of uterus with a premonitory sign. If there is any situation that may lead to abnormal labor force during pregnancy, it is recommended to go to the regular hospital in time and follow the doctor’s instructions to deal with the treatment to avoid delaying the condition.