Abstract: Station emplaced is an important technology part of the marine environment monitoring work，occupying the significance part of obtaining representative monitoring data and servicing environmental management． This paper used Q-type classification method to optimize the monitoring sites in Liaodong Bay． Water representative stations were optimized from the original 29 to 22． The environmental quality of the optimized samples was equivalent with the coastal environment quality，and more representative than the conventional monitoring stations． Increasing the sampling efficiency and saving costs of the monitor，the study on the optimization technology of coastal waters sampling had realistic meaning．