Abstract: Based on the mean temperature time series of Hongkong and Macao,the long temperature time series for the past 100 years in Shenzhen are created by using the regression method. In the 20th century,there is a temperature warming trend in Shenzhen. The mean annual temperature trends are 0.6℃/100 a. Except for spring temperature,there are obvious warming for seasonal temperature and annual temperature from late 1980's to 1990's. The cool/warm winters of the serious and extremely serious degree happened in the 100 years. Most of the serious cool winters emerged before 1950's,but most of serious warm winters are in the latter half of century. Especially in 1990's,there are four serious warm winters.