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At present, there are still some limitations on the existing hand drawn sketch recognition systems. We presented a recognition method of a single electrical components based on primitives and the number of primitives. The system uses MATLAB as software platform. Firstly, we get the coordinates of each stroke of the hand drawn map and the coordinate of the sampling points on each stroke. Then, we reduce the influence of the noise by simple smoothing and repeat removing processes. In addition, our recognition object's structure features are relatively stable, and all electrical components are consisting of a single or some primitives. So we realized the recognition method based on primitives and the number of primitives. Experimental results show that the system can effectively reduce the limitations of users , and reduce the identification error rate. In addition, this system can achieve a higher accuracy of recognition results.