The invention discloses an application of a medicine with the functions of tonifying qi and promoting blood circulation to preparation of medicines for treating insomnia. The medicine with the functions of tonifying qi and promoting blood circulation comprises the following active pharmaceutical ingredients in parts by weight: 100-150 parts of radix astragali, 80-120 parts of radix codonopsis, 60-100 parts of Danshen root, 60-100 parts of kudzuvine root, 60-100 parts of epimedium herb, 60-100 parts of hawthorn fruit, 40-80 parts of rehmannia root, 40-80 parts of Chinese angelica, 40-80 parts of coptis root, 40-80 parts of rhizoma corydalis processed with vinegar, 40-80 parts of lucid ganoderma, 20-30 parts of ginseng and 20-30 parts of liquorice root. The pharmacodynamic experiment study finds that the medicine with the functions of tonifying qi and promoting blood circulation has a definite blood vessel relaxing effect and also has obvious scavenging effects on free radicals of nitrogen, hydroxyl and nitroxide. The medicine can achieve the effect of increasing the calm heart rates, total heart beats in 24 hours, the fastest heart rates, the slowest heart rates and the average heart rates of slow arrhythmia patients. A randomized controlled trial of the application shows that the medicine has definite curative effects on slow arrhythmia.