At the regulatory detailed planning stage, the regulatory planning parameters which influenced thermal environment were classified and the new standard effective temperature, wet bulb globe temperature, urban heat island intensity were all considered as the thermal environmental evaluation index. Based on the developed urban regional thermal climatic prediction model, one-variable method was adopted to analyze the effects of different regulatory planning parameters on these evaluation index. The hourly simplified models of each evaluation index were obtained and showed rapid, simple, and accurate characteristics by comparing with the original model. By combining the data input module, the meteorological parameter maintenance module, the regulatory planning parameter maintenance module, graph presentation module, data output module and the hourly simplified calculation models of evaluation index, the thermal environmental evaluation software for urban detailed regulatory plan was developed and then applied to a field study in Guangzhou. Hourly thermal environmental indicators OUT-SET^*, UHII, and WBGT of four test blocks were obtained and the spatial visualizations were realized. Results showed that the average OUT-SET^* within the whole research regions ranged from 28 ℃ to 30.5 ℃, and the maximum WBGT varied between 29 ℃ and 30 ℃. The UHII of block 1 to 3 varied between 0.4 ℃ and 1.2 ℃ while that of block 4 had the urban cool island effects. Thus, it reveals that different regulatory detailed planning indicators have important impacts on the thermal environmental parameters.