During the recycle process of malysite in sludge under the synergistic effect of acidification and ultrasonic, the features of malysite, the principles and steps of design calculations for sludge malysite are introduced on the basis of the previous experimental data. According to the function, the design process can be classified into pretreatment unit, coagulation treatment unit, malysite recovery unit, sedimentation and filtration unit. Design calculations are conducted in the light of the requirements on design flow, cycle time, influent water quality, material and experimental data. Design calculations and selections as well as device construction are accomplished based on the design criterion of water treatment. Ultimately, the parameters of each treatment unit responding to the design process are obtained through the experimental validation by means of the constructed experimental device.