Abstract: Researches in the sib Congress of CPC an event of nearly 40 years ago, are closely related to the Party’s exploration of socialist road. During the 20 years before the 3rd Plenary Session of the 11th Congress, this article maintains, the 8th Congress had been misinterpreted and become a forbidden topic because of the"leftist " ideas. As a result, no real research had been undertaken until after the 3rd Plenary Meeting of the 11thCongress. Three advances had been made since then: First, the leftist spell was broken and the important historic part the sib Congress played was reestablished; Second, the sib Congress was then regarded as a newstarting point of socialist construction. and researches extended to the Party’s exploration for socialist road before and after it; Finally, from the new perspective of socialism of the Chinese style, the 8th Congress and theexploration before and since were re-examined and re-evaluated against the historical background of all the attempts CPC has made so far.