Fractal image coding uses the similarities between the best matching domain blocks and range blocks to reconstruct image. In the transmitted information, the information about the best matching domain blocks occupies a large percentage, so the reduction of information about the best matching domain blocks is the most effective method to reduce the quality of transmitted information. On the other hand, there are similarities between range blocks from each other. So, when range blocks are similar enough, we can reconstruct a range block by its similar range block, in other words, we can use the same domain block as their best matching domain block between similar range blocks. In this paper, we propose a method using similarities between the range blocks to reduce the position and affine information of the best matching domain blocks by sharing the same best matching domain block between similar range blocks.