In the course of the industrialization and the socialist modernizalion construction ofour country which is backward in economy and culture and undeveloped in productiveforce. how to treat the Non-publicly-owned(NPO. hereaffer) economy and develop thepublicly-owned and NPO economies at the same time is a great issues pazzling our socialist country over a long period of time. After the founding of New China. CCP hadmade a harduous inquiry into this issue. However, due to many causes, The Party’sNPO ecnnomic policies had undergone a tortuous way, especially in the 30 years beforethe 3rd plenary session of the 11th central committee of CCP. it was more tortuous,complicated and changeable, and a NPO economic policy suitable to the Chinese devel-oping condition of productive force had never been found. This is a new issue to besearched deeply. This paper, through the retrospection of the evolutionary history ofthe party’s NPO economic policy in the early 30 years of new china, analyses the mainreasons for the serious mistakes of Party’s NPO economic policy and summarizes theexperiences and lessons with the aim of be useful and benefitiaI to the understanding atpresent of the new thoughts new policies about the socialist state of ownership, re-searching and perfecting the structure of it continuously.This paper consists of three parts.In part one, the author makes a retrospection of the Part’s NPO economic policiesin three historcal periods. In the period of revival of the untronal economy, the Partyhad a right understanding to the chinese productive force, and on the basis of that, shehad formulated a quite right NPO economie policies. In the period of the first Five-year-plan, the socialist transformation began, the essence of which was to change theindividual ownership into the public one. Eliminating the individually-owned economytoo early artificially, causing an unfavourable effect on Chinese economic developmentand people’s lives. In the third period from "The Great Leaps Forward" to the 3rdplenary session of the 11th central committee of CCP. The subjects of the NPO econo-my had been transformed, and the main points of the Party’s NPO economic policeswere towards the self-held field in the contryside, household sideline production, mar-ket trade, and individual commerce and minor hand craft industry in cities. Even tothe remaints of the NPO economy, the Party’s POlicies also experienced changes from"left" devialion to redreSSing" left", to" Left" devialion apain, to at last extrome" Left".In part two, the author makes an analySis of the cause of the tortousness and mis-takes of the party’s NPO economic policies. He thinkS that the direct negation of thevalue of the caPitalism, taking the place of rational value judgement based on the scien-tific analySis, is the first cause. The direct neqation of the capitalist rationality existingin the specific historical period directly affected the formulation and corrying out of theParty’s NPO economic POIicies. And what’s more, in the period of demoeratic revolu-tionary, The Party had paid much attention to the combination of theory with prac-tice, taking the way of distinctive chinese features. After the success of Chinese revo-lution. however, the Party hadn’ t logically, on the basis of that, made scientific re-search or careful deliomination of aspects of characteristics of the Socicalism to befounded in the future, but simply approved the soviet mode, and mechanically copiedcertain Marxist -- Leninist conclusions. This was the imPOrtant basis fOr the stern mea-sure adopted by the Party, for the NPO economy. Thirdly, The Long-term "Left"de-via tion in economy and pocitics is also one important cause for the mistakes of the Par-ty’s NPO economic POlicies.In part three, from the angle of rumination over history, it ruminates the NOPeconomic POlicies in the early 30 years of china, with the aim of providing some refer-ences for the