The fragrant smell passes through the orifices of the mouth, nose and skin, and under the action of the heart, lungs, spleen and stomach, it achieves the purpose of balancing qi and blood, harmonizing the five internal organs and invigorating the spirit. However, the validity period of aromatherapy powder is about half a month to one month. If the spices are not changed in time, the effect will be discounted. Although cassia seed has the effect of clearing away heat and improving eyesight, it is difficult to exert its effect through contact with cloth and clothes. So, how to choose car cushions in summer? Lecturer Cong Xiaole, an automotive interior expert in the automotive application department of Nanjing Traffic Technician College, introduced that bamboo mats, hemp mats and cool cotton mats are generally suitable. Cong Xiaole also reminded the majority of car owners that the weather is hot and humid in summer, and the car is prone to mildew. In order to keep clean and hygienic, the cushion should be dried and cleaned in time.