ARIZ is a specialized method of solving the complex problems in TRIZ theory, which integrates multiple methods and tools of TRIZ, and sets up a systematic process of thinking and solving problems from the problem analysis to the scheme optimization. In order to solve the problem that the filter gauze was difficult to be cleaned, easy to be damaged, easy to be blocked, and that the sludge still remained high water content after dewatering which were inherent with the common using of the equipment for sludge deep dewatering, ARIZ and knowledge based thinking and creative solutions were proposed. According to the process of the progressive implementation of ARIZ's nine key steps to analyze the problem model, a creative solution that the modular processing equipment for sludge decrementing efficiently and deeply was designed. Further results of the study not only confirm the validity and practicability of the ARIZ method to solve the complex engineering problems, but also provide the scheme support for the further design and processing of the device, and it also can provide a scheme to develop a new type of equipment for sludge decrementing efficiently and deeply.