Abstract: Abstract:After reviewing of the two measurements of Gross Output of Industry ＆ Agriculture, the difference is found in the criterions of ＂Production boundary＂ and ＂Measurement of output＂ .According to the analytic function of gross output indicators and the basic rules of input-output analysis, ＂product principle＂ should be treated as fundamental method in goods accounting and technical guideline in practice. As regards the services, the similar principle should be applied in its accounting.