thanks for the answer of Lars, Matt, Nicolas, ChunTian ! I think i know how to fix the problem!
    for me it is the first time to use mail list!( i know it is weird:) ) i do not know whether reply the mail to someone who give me a answer or reply the mail to the sbcl-help! whatever, i just try to thank everyone! if i did something wrong, just tell me, so i can do it correctly!
    ps: to ChunTian ,yes i am a chinese! thanks for the help!