By using temperature, humidity, wind speed, wet bulb globe temperature (WBGT), and solar radiation data during May to September 2008 and May to July 2009 obtained from Tianjin boundary layer observation stations, through correlation analysis and multiple regression, a WBGT simplified calculation method is established. At the same time, by using Rayman model, based on the cloud cover the average radiation temperature is calculated, achieving the weather forecasting factors, combining with GB/T 172441998 and ISO 7243 standard systems, further using WBGT forecast products and giving a proposal about labor time arrangements in the next 6 hours, so as to reduce the injury from high temperature outdoor working. The results show that, the WBGT is highly related with drybulb temperature and solar radiation. Based on conventional meteorological data and average radiation temperature, the WBGT simplified calculation methods are practical and feasible. If the WBGT prediction products are applied to the future work schedule arrangements, there will be a better guide effect.