How to make a USB flash drive system boot disk?

Now most computers do not have the optical drive, and the CD-ROM drive occupies a large space, carrying inconvenient, then if you use a U disk to install the system?

First, we need to find an empty USB flash drive, download the UltraISO software, and install:

① start UltraISO as an administrator

② opening the installation system ISO file

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③ Select write to hard disk image

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④ Click to write, default settings

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⑤ booting into BIOS system by F2 or F10

How to make a USB flash drive system boot disk?