Single atrial premature refers to single atrial pre-systole, single atrial pre-systole how many times is normal is not clear, generally believe that the number of pre-systoles within 24 hours does not exceed 100 times is normal. Atrial pre-systole is a common arrhythmia that can occur in both normal people and patients with organic heart disease. Currently, there is no authoritative data specifying how many times a single atrial pre-systole is normal, and it is not clear. However, in general, it is considered normal to have no more than 100 premature beats within 24 hours of a single atrial pre-systole. Usually, patients with insignificant symptoms of atrial pre-systole do not need treatment, but need to improve bad habits, maintain emotional stability, pay more attention to rest, and review on time. However, for patients with frequent palpitations, chest tightness and other symptoms of atrial pre-systole, it is necessary to actively carry out standardized treatment. All in all, patients with atrial pre-synstole need to strengthen their daily life management and go to the hospital for regular checkups, so that doctors can understand the changes in their conditions.