An innovation method for conceptual design of mechanical products was proposed,combining the theory of inventive problem solving(TRIZ)with extension innovation method,and a conceptual design process model was established based on both.By es-tablishing user requirement primitive model and conjugate analysis,the correlation between product requirements and functions was de-termined,the product function decomposition tree was established,the root conflict was obtained;then the original understanding corre-sponding to the engineering parameter query was extracted by using TRIZ tool set,multiple concept solutions were generated by the to-pologically transformable transformation.Finally the solutions were quantitatively evaluated and preferred by using the superiority evalua-tion method.The innovative design of the system was carried out with a small pipeline dredging robot as an example,and the practicality and effectiveness of the method were verified.
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