Abstract: Based on meteorological data and record of weather phenomenon at Chongming meteorological station in Shanghai, a research of the climate change and effect on ecological environment in Chongming island are carried out by using climatic statistics methods. The results show that air temperature rose significantly, days of high temperature and extreme maximum air temperature rose from 1961 to 2016. Meanwhile, precipitation and rainstorm days at Chongming also increased, of which the proportion of the rainstorm and heavy rainstorm increased only but the light rain, moderate and heavy rain declined. Besides, it decreased obviously in wind speed, days of strong wind, sunshine duration, relative humidity, while increased indays of fog.Under the impact of climate change, the first day of frost-free season shifted to an earlier date while the last day delayed, leading to extension of frost-free season. It also increased in effective accumulative temperature and days of human comfort. But, it also leaded to the decline of wind resources, and adverse weather condition to diffusion of contaminant. This research could support to build a green, safe Chongming and sustainable development of eco-island.