Less development is a kind of universal social phenomenon, a necessary choice for the relatively undeveloped countries to take in the historical background of the world, and also an inevitable outcome of the develop of world history. The less development has its own advantages since the temporary backwardness in the fields of economy and culture does not prevent the less developing countries from directly absorbing and taking advantage of the newest achievements of civilization. So these countries can learn the lesson of the past to avoid taking a roundabout way. Only under the condition of world history can the advantage of backwardness be entirely revealed. The less development is a leaping, catching up and surpassing development, so from the beginning it was challenged by different factors, especially by the “demonstration effect” of the developed country. Therefore, these countries are always be caught in the dilemma characteristic of the less development.