What's wrong with my system?
I've installed the two files for nvidia ,but the problem still exist.
Some information in the "XFree86.0.log" is:

(WW) NVIDIA(0): The user specified VertRefresh "50.000-70.000" has been
(WW) NVIDIA(0): adjusted to "50.000-60.000" (the intersection with
(WW) NVIDIA(0): EDID-specified VertRefresh "0.000-60.000"

(WW) NVIDIA(0): Not using mode "1024x768" (width 1024 is larger than
(WW) NVIDIA(0): EDID-specified maximum 969)
(EE) NVIDIA(0): No modes remaining for Display Device 0
(EE) NVIDIA(0): *** Aborting ***
(II) UnloadModule: "nvidia"
(II) UnloadModule: "ddc"
(II) Unloading /usr/X11R6/lib/modules/libddc.a
(II) UnloadModule: "vgahw"
(II) Unloading /usr/X11R6/lib/modules/libvgahw.a
(EE) Screen(s) found, but none have a usable configuration.
Fatal server error:
no screens found

When reporting a problem related to a server crash, please send
the full server output, not just the last messages.
This can be found in the log file "/var/log/XFree86.0.log".
Please report problems to xfree86@xfree86.org.

Is the option of the monitor wrong?
Could any one help me?

hmm, you didn't specify what disto you are using, that would help as the programs used for config/diagnosis are different depending on your distro, but if it's redhat, then try running Xconfigurator and having it try and autoprobe your settinfs for you
debian, i think it's someting like anXious.
p.s. noticed this was your first post, welcome to lq

another thing you might want to try is to recompile the kernel to do that