The kitchen and bathroom should be located in the north of the house or in the hot mountainous terrain in spring and summer. Especially in the kitchen, the best and most suitable scheme should be set in the north direction of the house or the air outlet of the hot mountain terrain in spring and summer. This is incompatible with the traditional concept of geomantic omen, but it conforms to the setting of natural wind direction. The general trend of air flow in China is (observable): it is hot in spring and summer, and the general trend of air is from south to north, that is, the south wind dominates. After the cold weather in autumn and winter, the overall airflow direction is from north to south, that is, the north wind dominates. This airflow characteristic, the kitchen is located in the north direction, which is beneficial to take the hot air generated by the kitchen out of the room when the hot south wind dominates in spring and summer; When it is cold in autumn and winter and the north wind dominates, the hot air generated by the kitchen is brought indoors. Relatively speaking, the room looks warm in winter and cool in summer. Similarly, the toilet is hot in spring and summer, dominated by the south wind, and the smell of the toilet can be taken out of the room. It's cold in autumn and winter, and the north wind is dominant, that is, the smell of the toilet is brought indoors, and the probability of bacteria and viruses breeding is much lower, which is beneficial to people's physical and mental health.