1. The first thick film screen printing Cu electrode with high conductivity ( >10-6 Ω), which is comparable to thick film Ag electrode has been successfully made in air firing instead of reducing atmosphere firing
2. The concentration of Al increased dramatically at the beginning when the specimen was immersed at high solution temperature since the replacement reaction was intense.
3. To make a good thick film screen printing Cu electrode by the novel method we proposed in this study, it is necessary to optimize the Al paste parameters such as solid content, particle size of Al powder and CuSO4 solution parameters such as pH , temperature, soaking time.