The permanent exhibitions of Science and Technology Museum are major content of its exhibition and education, they are also the most important style for the public to take the informal science education.

E-commerce has made impact on the conventional international tax system in the following aspects:permanent establishment concept,criteria of residential identity,classification of the quality of income.

That is,the country that the general permanent establishment lies in has the exclusive taxing right.

The function of the concept of permanent establishment in the international tax agreements is to indicate substantial economic connections between non-resident s transnational business activities and source states.

Besides this, electronic commercial affairs impact the rules of income limit, impact the rules of the identification of income resourses and inpact the rules of permanent organizations.