Abstract: With the aggravation of population aging and the increase of urbanization rate, the family structure in our country is becoming more and simple, the proportion of the elderly living with their children is decreasing, and the demand for social pension for the elderly in our country is increasing. At the same time, on the premise of meeting the basic pension, the elderly pay more attention to health preservation, heart preservation and personality preservation. Therefore, all parts of the country have begun to build a new type of pension community which integrates entertainment, health preservation, medical care, and catering. This type of building has the characteristics of significant functional characteristics and diversified business. As an important part of the infrastructure of the pension community, the reliability of the power supply system is directly related to the quality and safety of life of the elderly. This paper explores how to improve the reliability of power supply in pension communities from aspects such as load level, power supply source, power station, low-voltage distribution and cable selection, and provides references for electrical designers.