By controlling electrochemical polymerization conditions the linear conducting polymers have been fabricated not on the electrode but on the bottom of the cell. The Y-shaped one was also fabricated. The important factors are to change the concen-tration of monomer during polymerization and to make the groove on the surface of the bottom. It is suggested that the linear network of conducting polymer can be fabricated by controlling the polymerization conditions. In order to add the learning effect to the conducting polymer, the composite two-dimensional conducting polymer has been used. Whether the composite polymer was pretreated or not can be checked by dropping ethanol. This method can be used for memory or learning effect of conducting polymers. (c) 2005 Elsevier B.V. All rights reserved.