Text input method based on Arabic letter nominal form coding

The invention relates to a text input method based on Arabic letter nominal form coding, the selected Arabic letter nominal form is mapped on a keyboard, the Arabic letter nominal form coding accords with ISO/IEC international standard 10646-1, and the step of inserting unblind is also included when typing an Arabic letter through the keyboard; the location of the typed Arabic letter is analyzed when outputting and corresponding manifesting form is output, the unblind serves as an Arabic letter with four manifesting forms when analyzing, and the unblind serves as a zero-width invisible character when outputting; in addition, a controllable quad is arranged for users to adjust the lengths of words. Humane manifesting form is achieved by using the invention, and the manifesting of words is more beautiful by adopting the controllable quad to adjust the lengths of words.