In the important speech in the discussion forum of chief provincial and ministerial leaders on July 26th, 2017, General Secretary Xi Jinping made important strategic judgment for new development period of the socialism with Chinese characteristics. Correctly understanding of the new development period and its feature of the socialism with Chinese characteristics must take Marxism theory and methodology as the guidance, scientifically understand the dialectic relation between initial period of socialism and new development period of socialism with Chinese characteristics, especially understand the national situation from the perspective of global pattern and its new change while overall understanding China’s situation. The construction of socialism with Chinese characteristics has made great achievement and enters into a new period, which means that Chinese nation realizes the historic leap from standing up, to becoming rich and to becoming strong, which means that socialism in China is fresh with strong vitality and continuously opens new situation, which means that socialism with Chinese characteristics has expanded the way for the developing countries to realize modernization and which provides Chinese wisdom and China plan for solving human problems.