Abstract: According to the short time of the "Three Represent's" being put forward and the obscure realization of whether listing them in the Party's constitution is mature,the author specifically demonstrates that the "Three Represent's" were advanced after comrade Jiang Zemin presided the work of the Central Party Committee for 13 years,when the third generation leadership collective with comrade Jiang Zemin as its core led the whole Party to explore the great subject of what party in power to build and how to build it and finished the leap process of going from pratice to theory and from the quantity change to the mass change.