Emotional instability after pregnancy should be considered to be related to changes in hormone levels, but may also be related to family and environmental factors. The hormone level will change after pregnancy, the hormone level changes will affect their own emotions, this is a normal physiological phenomenon, after the third month of pregnancy or after giving birth to a child, the mood will gradually stabilize. Family factors, environmental factors, social factors may also affect the mood of pregnant women. Therefore, as family members and husbands, we must communicate positively with pregnant women to understand the reasons for their unstable moods, and try to appease them as much as possible, so as to prevent the occurrence of depression during pregnancy or after childbirth. It is recommended that if a pregnant woman is unable to control her emotions, she can go to the hospital for examination and active treatment of any problems.