This study aims to evaluate the risk of climate warming in the employee's work, a construction company in pathumthani province. A sample of 54 people. Age between 20-60 years old, divided into work groups, work groups, the morning and afternoon, based on the actual working of the sample group. A sample of departments cut and bending steel works duration morning inside the building. The Department consists of a steel frame and a tie made of local area outdoors. The maintenance department works indoors and outdoors. Measure the body comparison between before and after the work is finished, The amount of drinking water, The Subjective workload index (SWI) and WBGT weather while working it was found that blood pressure, resting pulse, body temperature and a decrease in body weight was in the safe. The Subjective workload index (SWI) was moderate. Most of the pain is the lower back and lumbar area of work. The weather WBGT (Tw, Td, Tg) in the afternoon more than in the morning were significantly (p