Abstract The launching of the reform program in 1978 went hand in hand with praising Chinese youth as the vanguard of the new struggle for modernising China. Yet, the official rhetoric projected the ideal youth, while being at odds with the complex reality of the early post-Mao era, when the experience of the Cultural Revolution (CR) turned out to be the main reason for the so-called ‘youth problem’. Both international and Chinese literature have highlighted that in the reform era, youth, intended as a social and cultural category or construct, came to be associated with less positive values, and the traditional discourse of ‘youth as hope’ proliferated along and intertwined with a negative discourse of ‘youth as trouble’. This paper looks at the re-emergence of the Communist Youth League (CYL) as a key institutional actor in setting the stage for the construction of a new social discourse on youth in the transitional period 1978–1981, when the Chinese Communist Party (CCP) leadership confronted with the need to deal with the tumultuous upheaval of the CR and its impact on youth on the one hand, and to push forward the reformist agenda on the other. By mainly relying on CYL sources (documents, internal publications and the official youth press), a part of which has been largely unexplored so far, it shows how the discourse on youth became complex and multifaceted in those historical circumstances, reflecting not just different views within the élite but also and most importantly the very tensions involved in the reform project. While the existence of the ‘youth problem’ led to establishing a causal nexus with the now condemned ultra-leftist tendencies associated with Lin Biao and the Gang of Four, the need to make sense of the complexity of youth boosted a heated debate on youth characteristics, with a number of cadres and adult experts affiliated to the CYL defining, describing and prescribing what Chinese youth were in ways that, by ensuring they had not been guilty as former Red Guards and recognising them as both victims and increasingly emancipated actors, eventually pushed forward a new idea of youth that conformed to the new modernization aims of the Party. Providing an assessment of the young generation and its inclinations in the aftermath of the CR eventually became the premise for facilitating the emergence of a new youth subjectivity, while envisioning the integration of the self within the broader collective and the coexistence of liberal values with traditional socialist ethics. The debate on youth characteristics reflected the complex changes taking place in China and was constitutive of a broader process that set the stage for rethinking the socialisation of youth in the post-Mao era.