Why Mao Zedong defined second plenary session of seventh contral committel as party representive conference

In the conculsion of second plenany session of seventh contral committee,Mao Zedong defined Second Plenary Session of seventh contral committee as party representive conference because of two main reasons: Ⅰ.During Xibaipo Period ,according to the party organizations developing condition in the whole country,the party central committee had asked party organizations to convene Party congress or representive conference many times to study new stuation and tasks. Ⅱ.The agenda and centent of the Second Plenary Session are a series of fundemantl policies for the development of the nation and future society.