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Choosing the right day means choosing the right luck. Choosing the right luck is the need of human survival. In order to survive, human beings must have a safe living environment, and the purpose of choosing the right luck is to be safe. Choosing good luck is an effort made by human beings to choose and make use of favorable conditions in order to avoid and overcome unfavorable factors, and it is also the nature or instinct of human beings to seek good fortune and avoid evil. Choosing a good luck means that human beings use wisdom and experience to find and determine the right time and space for various activities in the world. The key point is to fully grasp the timely opportunities brought by the harmonious relationship between time, place, people and above. Choosing good luck can meet people's psychological needs and increase their confidence and determination.