This paper introduces the application of TRIZ theory to improving the process of solid carrier element extractor. First the advantages and disadvantages of the existing elements extractors are pointed out, the ideal solution is proposed, and the invention theory is innovated to improve the design of the conflict matrix. The improved ball element extractor expands the contact surface with the surrounding soil to the maximum, and can be better adapted to the characteristics of electric field, thus providing a more convenient and broader channel for the electric active material in the soil to enter the extractor and hence maximizing the efficicney of the electric extraction process.