[en] The space dose rate is one of the major types of information that must be referenced during the early planning stage for dismantling a nuclear facility, especially a highly radioactive facility such as a nuclear power plant. While the space dose rate to be reflected in the dismantling plan can be obtained through direct measurement in the workspace, in the case of a high radiation field in which a direct measurement is not possible, an analytical dose rate simulation is alternatively a useful tool. There are various approaches to recognizing intuitively the analyzed dose information, and accordingly, a suitable solution is chosen depending on the purpose. This research proposes a suitable software framework that can directly interface and visualize a three-dimensional space dose rate on a CAD (Computer Aided Design)-based dismantling process simulation tool. The space dose rate visualization module based on this framework is implemented into our own dismantling process simulator by a CAD API (Application Programming Interface). As a result, it can visualize both the three-dimensional space dose rate and radioactive equipment model in the same virtual space, and provides useful information to users in real time for planning the dismantling process. (authors)