Asthma attacks can be painful and even life-threatening in severe cases. Good self-management and rational use of medication can help control asthma and significantly improve the quality of life of patients. In addition to taking your medication on time, keeping an asthma diary is also a crucial step in self-management. First of all, you need to prepare a peak flow meter, a small, portable and simple lung function meter, which can be bought in hospital kiosks or general medical equipment stores, please note the distinction between children and adults when buying. Then open the box of the peak flow meter, there will be a sheet of paper with a blue form inside, please use it as a template to make several copies, bind the copies into a booklet, and then record in this bound booklet, or just download the chart at the end of this article – Symptom and Peak Flow Rate Record Sheet (please note the distinction between children and adults) and print it. What should I record? The first is the peak flow rate value, which reflects the status of lung function. Measurement time: 1.Measure once a day at a fixed time in the morning and evening (e.g. 6-8pm); 2.Whenever you feel uncomfortable and ready to use bronchodilator medication, measure the peak flow rate value before using the medication, and measure and record again fifteen minutes after using the medication (Note: When you have a severe asthma attack and feel obvious difficulty in breathing, peak flow rate should not be measured again, and you should seek medical attention immediately.) The specific test method is as follows: 1, the thick end of the transparent interface and the peak flow rate meter round mouth interface tight set. 2, the peak flow rate meter red vernier pointer gently dial to the lowest part of the scale (to zero). 3, the determination of PEF should be standing, try to breathe enough, and then the lips wrapped around the interface, pay attention to the lips around not to leak air, and then in the shortest possible time with the fastest speed to exhale all the air at once. 4, at this time the red cursor pointer pointed to the scale value recorded, that is, the highest expiratory flow value (PEF value). 5, each test is carried out three times, choose the highest of the three PEF value recorded in the corresponding date in the table below the corresponding position (the vertical axis of the table in the record paper from the bottom to the top of the size of the peak flow rate value, just draw a mark in the corresponding position, “dot” “circle (“dot”, “circle” or “asterisk” symbols are acceptable).