Abstract: From functional perspective,practice has mainly affirmative constructive function,transformative function,and negative deconstructive function.They correspond to practical freedom,quasi-freedom,and anti-freedom and then produce grace,sublime and humor,ridicule,ugliness in aesthetic realm correspondingly.These practical functions restrict and affect literal and artistic form and development in aesthetic form.Practical constructive function produces free,harmonious and gentle literal and artistic form from graceful aesthetic form.Practical transformative function produces quasi-free,surging and masculine literal and artistic form,and un-free,contradictory and inverted literal and artistic form from sublime and humor,ridiculous aesthetic form,and realizes the transform from classic art to modern art.Practical deconstructive function produces alien,deformed literal and artistic form from ugly aesthetic form and realizes the transform from modern art and post-modern art.

Key words: practice, constructive function, literature and art