Based on four high-resolution remote sensing images in 1988,2000,2009 and 2017, the ecological network in Haikou coastal zone was built by using minimum resistance distance methods. Combined with gravity model and Patch Center Index, the change trends of ecological network in the past 30 years are discussed. The results indicate that:(1) the number of ecological source region has decreased from 18 to 8, and ecological corridor has decreased from 43 to 15. Though less changes happened in core patches, the obvious effects caused by rapid reducing of grade 4 patches could be found. The interactivity between patches has weakened in the temporal dimensions. (2)Most of the ecological network stepping-stone patches, which play important roles in connectivity and biodiversity protection, distributed in gardens and wetlands. (3) The quality of ecological network has been declined, and the network model tended to be simplified. (4) Rapid urbanization and high intensity of human activities are the main driving factors for the weakening of the network state. The results provide scientific and practical guidance for building ecological network in Haikou City and, other areas with the similar situation.