To satisfy the requirement of density of aquatic for shrimp and crab pond aquaculture, the aquatic should be cut periodically. Based on the analysis of traditional manual reaping and river cleaning equipment, a whole new plan for reaping aquatic in shrimp and crab pond and designs of aquaticcuttingharvesting equipment have been proposed. Furthermore,demands were made on the size and data of exact dimensions and other important parameters of main working parts, which were based on the actual production needs. Hub cutter is analyzed by CFD software FLUENT in order to get the integrative data about in the field of dynamic pressure. The equipment is set to use cutter and worm conveyer with easy geometry, dehydrating in real time, without pumps, with good stability, high efficiency and adapting to any kinds of difficult working environments. Such equipment satisfies the needs of low cost,easy for assembling proposed by the actual demands.