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 key step in self-management. First of all, you need to prepare a peak flow meter, a small portable lung function meter (as shown in Figure 1), which can be bought in the kiosk of Concordia Hospital or in general medical equipment stores. Then open the box with the peak flow rate meter and there will be a sheet of paper with a blue form inside. Please use it as a template to make several copies and bind the copies into a booklet, and record them later 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. (2) Whenever you feel uncomfortable and are ready to use bronchodilator medication, measure the peak flow rate before using the medication, and then measure and record it again 15 minutes after using the medication (Note: When you have a severe asthma attack and you 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）Tighten the thick end of the transparent interface with the round interface of the peak flow tachometer. (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 performed three times, select the highest of the three PEF value to record the corresponding date in the record table in the corresponding position below (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 “(or “asterisks” and other symbols can be). Note: Conduct repeat tests before each test to dial the red vernier pointer to the lowest part of the scale. The highest value measured twice daily for two consecutive weeks with well-controlled asthma or the highest value measured when the condition is stable for 3 consecutive weeks of treatment is the personal best value. If the peak flow velocity value is less than 80% of the personal best value (for example, if your personal best value is 400, if the measured peak flow velocity value is less than 400 x 80% = 320), it indicates an asthma attack, and if you are undergoing desensitization therapy, you should not perform desensitization injections at this time, but should use medication to treat your lung function until it improves, i.e., when the peak flow velocity value rises above 80% of the personal best value. risk of triggering or aggravating asthma. Second, record the medication use. If medication is being used temporarily during treatment or because of subjective distress such as breath-holding or wheezing, note the medication used on that day, including name, dose and frequency of use, at the bottom of the corresponding date on the recording sheet (Figure 2). In the best case, you can record in detail the daily subjective sensation, the conscious triggers of symptom onset, etc., so that the doctor can judge the change of your condition at your next visit to reasonably adjust the medication. Figure 1, Peak flow rate meter Figure 2, Peak flow rate record