In this paper, we introduce the outline of “The MR-PreViz Project” performed in Japan. In the pre-production process of filmmaking, PreViz, pre-visualizing the desired scene by CGI, is used as a new technique. As its advanced approach, we propose MR-PreViz that utilized mixed reality technology in current PreViz. MR-PreViz makes it possible to merge the real background and the computer-generated humans and creatures in open set or at outdoor location. The user can consider the camerawork and camera blocking efficiently by using MR-PreViz. This paper introduces the outline of the MR-PreViz project, the design of hardware configuration, camera-work authoring method and the results of prototyping. CR Categories: H.5.1 [Multimedia Information Systems]: Artificial, augmented, and virtual realities