This paper mainly analyzed the variation characteristics of the mean temperature,the daily minimum temperature and the daily maximum temperature with the time over northern China,including Northeast China,North China and Northwest China,in 1951-2000.

This paper is mainly studied temperature change on Yellow River and Yazang sources and analyzed the features of the daily minimum temperature as well as the daily maximum temperature and the daily minimum temperature in Yellow River and Yazang sources in 1961-2001.

This paper is mainly studied temperature change on the Qinghai-Tibet plateau area and analysed the features of the daily minimum temperature as well as the daily maximum temperature and the daily minimum temperature in the Qinghai-Tibet plateau area in 1951～2000.

Brief Discuss on the conceptual model forecasting tool of the Maximum and minimum temperatures Sudden change

The main results are: 1) most of the temperature trends are positive,the warming rate of minimum temperature is higher than that of maximum temperature,the warming rate is high in winter than in summer,t.

The date of monthly mean maximum and minimum temperature are obtained in 74 stations in Northeast China,after minimizing the posssible effect of urban heat island from 1959-2002.

With fixed position observation for about 5years,the weather factor data such as relative humidity,average air temperature,maximum air temperature,minimum air temperature,average maximum air temperature and average minimum air temperature inside rubber plantation ecosystem were analyzed against the data outside the system.