Thank you answer my problem. I use maya7.I don't usage maya 8.Ha ha. Everytime I want to rendering hardware particles,or use hardware Texturing or hardware Fog or shadows in my scene.I turn up I can't useing.It's so bad. The software and mentelRay rendering is well in my work. En.....Looked like I besides replaced my Graphics card already not to have other means. OK,thanks eveyrbody!:attn: