Bronchial asthma is an ailment which causes the aviation route way of the lungs to swell and tight. Because of this swelling, the air way delivers overabundance bodily fluid making it difficult to inhale, which brings about hacking, short breath, and wheezing. The illness is ceaseless and meddles with day by day working. The point of this examination was to survey the connection between nutrient D level and seriousness and control of bronchial asthma among grown–up patients in Hi tech medical college. This planned cross–sectional investigation, led at Hi tech medical college. Eighty–six asthmatic patients took an interest in the investigation subsequent to taking their assent. Statistic information were gathered utilizing organized survey, the clinical parameters of asthma seriousness and control were estimated by the criteria of Global Strategy for Asthma Management and Prevention of the Global Initiative for Asthma (GINA). Aviation route confinement was evaluated utilizing Peak Flow Meter. Three ml of blood was taken from every patient to gauge nutrient D (25(OH)D) utilizing compound connected immunosorbent measure (ELISA) and information were broke down utilizing the factual bundle for sociology (SPSS) rendition 20. Ordinary serum 25(OH)D (30–50ng/ml) was found in just 2.3% of patients. The mean serum 25(OH)D dimension in patients with controlled asthma was 25.82±17.27ng/ml while in patients with uncontrolled asthma it was16.48±7.14ng/ml. (P esteem = 0.005). The mean serum 25(OH)D dimension in patients with extreme asthma was 16.15±6.9ng/ml (P esteem = 0.151). There was a positive relationship between‘s nutrient D level and bronchial asthma control and a negative connection with bronchial asthma seriousness among the examination gathering.