AbstractWe are developing a virtual surgery system to conduct realistic surgical procedures in a virtual world; its purpose is to master and practice surgical techniques and to improve planning for operations. In this study, we present a deformable organ model created using the sphere‐filled method. Further, we equipped this model with senses of touch and force by connecting it to a force feedback device. The result was that the sphere‐filled model allowed our system to perform various physical manipulations, including blood vessel deformation. In addition, by applying tactile sensations in virtual space our system provided the user‐surgeon with a realistic simulation. © 2004 Wiley Periodicals, Inc. Syst Comp Jpn, 35(13): 1–9, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/scj.10689