解决办法： 1：在centos中安装ntfs-3g和os-prober。 [ntfs-3g]wget (https://tuxera.com/opensource/ntfs-3g_ntfsprogs-2015.3.14.tgz) 2：运行grub2-mkconfig -o /boot/grub2/grub.cfg出现下图提示：

grub2-mkconfig -o /boot/grub2/grub.cfg
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-3.10.0-327.18.2.el7.x86_64
Found initrd image: /boot/initramfs-3.10.0-327.18.2.el7.x86_64.img
Found linux image: /boot/vmlinuz-3.10.0-327.el7.x86_64
Found initrd image: /boot/initramfs-3.10.0-327.el7.x86_64.img
Found linux image: /boot/vmlinuz-0-rescue-08110bed159d42b487ce3200ed07c40d
Found initrd image: /boot/initramfs-0-rescue-08110bed159d42b487ce3200ed07c40d.img
**Found Windows 7 (loader) on /dev/sda1**
done

我的win10被识别成Winows Recovery Enviroment了，进入/boot/grub2/grub.cfg多了类似如下内容：

menuentry 'Winows Recovery Enviroment (loader) (on /dev/sda1)' --class windows --class os $menuentry_id_option 'osprober-chain-FEE4DCEEE4DCAA63' {
    insmod part_msdos
    insmod ntfs
    set root='hd0,msdos1'
    if [ x$feature_platform_search_hint = xy ]; then
      search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-bareMetal=ahci0,msdos1 --hint='hd0,msdos1'  FEE4DCEEE4DCAA63
    else
      search --no-floppy --fs-uuid --set=root FEE4DCEEE4DCAA63
    fi
    parttool ${root} hidden-
    chainloader +1
}

3：重起后即可进入win10