Youth in the new era is an important strategic resource loaded with "vital force to promote the development of history and social progress", a vital force for national rejuvenation, and a continuation of the construction of a strong nation. In the new era, young people should strengthen their Marxist belief, establish correct life ideals and value pursuits, and gather young people's strength for the Chinese dream of realizing the great rejuvenation of the Chinese nation. Based on the logical theory of " why-how-how, " this paper re-examines the value implication, the requirements of the times and the practical approach of the ideal and belief education of young people in the new era. Firstly, it profoundly explains the intrinsic value of youth's ideal and belief "how to educate" in the four dimensions of politics, economy, culture and science and technology under the background of the new era. Secondly, it puts forward the requirements of the times that young people in the new era should adhere to the " leadership of the Party ", practice the " original mission "', carry forward the " fighting spirit ", and always " live up to the people ", laying the foundation for the realistic basis of " how to educate ". Finally, the deep practice of " three ambitions, "" three hardships, "" three qualities " and " three bottoms " constructs the practical strategy of " how to educate " young people's ideals and beliefs in the new era.