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Using the regional boundary layer model developed by the Nanjing University (RBLM), the radiosonde and ground observation data of the Yinchuan national reference climatological station,the characteristics of the temperature fields before and after the implementation of the current urban planning are simulated under three typical wind speed conditions in four seasons. Results show that in the present situation, the high temperature area is greater in small wind and high wind conditions than in general wind condition in summer; the high temperature area is the largest in small wind and the least in high wind in winter; the high temperature area is the largest in general wind in the spring and autumn. The urban heat island effect is very significant in all seasons in Yinchuan, and temperature is greater around the waters than in the urban area in the night time, and vice versa in the day time, especially around 14:00 At 14:00 air temperature in the urban construction is obviously higher, and the denser the construction sites, the higher temperature is; only in the winter small wind and the spring strong wind conditions, the difference is small. After the implementation of the urban planning, the temperature field distributions under three kinds of typical wind conditions are consistent with the present situation in general,but the high temperature area is smaller and the low temperature area is larger. Under the three typical wind conditions, the heat island area is less, and the urban heat island effect weakens, compared to that before the implementation of the urban planning.