In this paper, to know sedimentation efficiency compared with sedimentation efficency`s experiment result by general and inclination plate settler, its and fin stick of inclination plate. Experiment result is inclination plate settler increase sedimentation efficency`s 6.96% than general settler, When fin stick of inclination plate is the optimum condition of one side, inclination plate`s angle 60˚, fin`s width 67mm, fin`s interval 200mm, sedimentation efficency of many experimental condition increase 6.63% than inclination plate settler. A study on the site plottage through the result, Water inclination plate settler of the present`s application reduce 30% of its than general settler. According to the above statements, fin stick of inclination plate`s sedimentation efficency is 0.95 times of inclination plate settler`s. Concluding remarks, Fin stick of inclination plate reduce 28.5% of its than inclination plate settler.