The invention relates to an ecological 
restoration method for a city watercourse. The ecological 
restoration method for the city watercourse is characterized in that the polluted city watercourse is comprehensively restored with the combination of physical, biological and ecological technologies, the ecological theory is used for reference in the treatment process, the ecological idea is used as the guiding thought, a complex water 
ecosystem structure is constructed and restored, the original 
natural state of the watercourse is restored, the self-cleaning capacity of a river 
system is improved, the environment is beautified, and the local city microclimates are improved at the same time. The ecological 
restoration method mainly comprises the steps of (1) controlling a 
pollution source, (2) modifying the river 
bank, (3) optimizing the environment of the river bottom, (4) modifying the watercourse, (5) conducting 
aeration and 
oxygenation, (6) constructing an 
aquatic plant community, (7) constructing a fish and macrobenthos 
community, and (8) maintaining the 
system. The watercourse ecological 
system restored through the ecological restoration method has the certain anti-interference capacity, on the premise that a large amount of exogenous 
pollution is 
cut off, the certain-strength interference can be resisted, and the good ecological 
environmental effect is obtained. After one-time input, the better ecological benefit can be obtained only with a small number of maintenance costs.