Abstract: With tfie rapid growth of social economy Tthe varied and intensive utilization of sea area brings great threat
and damage to the marine ecosystems. Countries around the woild successively use marine spatial planning ( MSP)
technology in reasonable airangement of marine space. Marine ecological red line zoning( MERLZ) is a new prac-
tice in the application of MSP technology in China. Ulis paper first summarizes Ae existi吒 MSP technology and
studies the MERLZ technology in flne-scale area with few cases in China. Then conclude a method mainly com-
posed of identifying the study area, evaluating biological and ecological elements, and deteiminii^ tfie ted line divi-
sion icsults. Ulis method is beii^ used in the MERLZ of Dongshan County. The initially con^)leted Doi^shan
MERLZ plan verified that usii^ MSP technology in marine ecological red line zoning is feasible. This paper is an
attempt in usi吒 MERLZ technology in flne-scale aiea. Tlie results of the study will provide reference for MERLZ or
other types of marine protection planning in county and municipal levels.