Based on meteorological data of recent 50 years at meteorological stations in Tianjin region,and employing methods of regression analysis,moving average,the Morlet wavelet transform and the Mann-Kendall test,this paper studied into annual changes of climate elements in Tianjin.The indicators for urban development,including GDP,the percentage of urban population,the income differences between urban and rural residents,and total fixed assets investment,were also considered for trend fitting and correlation analysis to the relation for nearly 30 years of each climate element.The results show that Tianjin has an average annual temperature increase of 0.35℃/(10 a) in past 50 years with a significant upward trend,while the decreasing trend for annual precipitation is not obvious,yet the time series cycle vibration is evident.Sunshine hours showed a very significant downward trend.1980s to early 1990s is the jumping point of air temperature,sunshine hours,temperature and sunshine hours differences between urban and suburban area for Tianjin region.There is a significant correlation between all the indicators for urban development and the temperature and sunshine hours,which means that all the indicators are closely related to the development of heat island and dark island effect in Tianjin.