Abstract：Practice, as the sensible activities of man changing and exploring the nature and social reality on purpose, has the function of positive establishment, changeable transformation and negative disconstruction. It corresponds with the freedom, quasi freedom, unfreedom and anti freedom of practice, and it also corresponds with grace(beauty), masculinebeauty(sublime), humour, comic and ugliness in aesthetic field. So far there has been much discussion about the establishment function of practice. But the transformation and disconstruction function of practice is neglected to some degree. Actually the transformation function of practice can transform the form of beauty from masclinebeauty(sublime) to the tragic, from the passive humour to the positive comic. The disconstruction function of practice can produce ugliness and the negative comic. So the different form of practice corresponds with the different categories of beauty, the transformation of practice corresponds with the transformation of the categories of beauty.
