The changes of temperature in China in the last 39 years have been studied. It is noticed that the temperature is increased by about 0.23℃ in China in the last 39 years. It is found that the most obvious warming occurs in winter time which is 0.78℃ increment and the secondary warming is a 0.34℃ increment, occuring in spring. But a cooling trend is presented in summer, which shows a -0.27℃ drop. Here the effects of the urbanization in China are also analysed. The annual temperature rising in the bigger cities is much more obviously found than that in the smaller cities in the last 39 years.