Vitrification is a new approach for cryopreser-vation, which could avoid damages due to iceformation and solution effects occurring underconventional methods. The factors and mecha-nisms keeping cell survival were not well un-derstood. Few studies were conducted on theultrastructural examinations about cryoinjuryand cryoprotect during vitrification of plantcells. This paper reports our studies on thechanges and mechanisms of ultrastructure dur-ing cryopreservation of rice ceils by vitrifica- Vitrification is a new approach for cryopreser-vation, which could prevent damage due to iceformation and solution effects occurring under contraventional methods. The factors and mecha-nisms keeping cell survival were not well un-derstood. Few studies were conducted on theultrastructural examinations about cryoinjuryand cryoprotect During vitrification of plant cells. This paper reports our studies on thechanges and mechanisms of ultrastructure dur-ing cryopreservation of rice ceils by vitrifica-