In this paper we propose a new CBL-based floorplan method that accommodates pre-placed blocks. We identify the problem of the previous CBL-based pre-placed block floorplan method, and suggest the solution method of this problem. In our method, CBLs consisting of only free blocks are perturbed and maintained during the simulated annealing. Pre-placed blocks are inserted during packing in such a way that the topology of the CBL after insertion of a pre-placed block resembles the topology before insertion. Thus, even with the inclusion of pre-placed blocks, the searching effort via simulated annealing yields acceptable results. Experimental results show that our floorplan method places pre-placed blocks effectively and efficiently.