摘要青少年精神疾病是一组慢性的、反复发作的导致认知、情感、行为和意志等精神活动不同程度功能损害的疾病，呈现一个连续的疾病发展轨迹。目前临床上对青少年精神疾病的诊断很大程度上依靠行为症状学指标，虽然在临床治疗实践具有一定的可操作性，但其评估太过于主观，缺乏客观的、有效的神经生物学指标，导致诊断的一致性较低，给此类疾病的早期诊断和规范化干预工作带来极大的困难。青少年精神疾病的前驱期临床表现缺乏特异性，在出现明显的精神症状之前已有多个认知领域的缺陷和社会功能异常。因此，青少年精神疾病跨诊断的临床分期在临床操作中具有重要意义。现以近年国际研究成果为基础，收集和整理最新的研究成果，并对2020年发表在《世界精神病学》杂志的"首个青少年精神疾病跨诊断的临床分期国际专家共识"进行解读，旨在协助临床工作者科学处理临床青少年精神疾病诊断困难的问题，为精准防治青少年精神疾病做出积极贡献。

abstractsYouth mental illnesses are chronic and recurrent and present a continuous disease development and progression, which cause different functional impairments like cognitional, emotional and behavioral disorders.At pre-sent, the clinical diagnosis of youth mental illness largely relies on behavioral symptoms.The diagnosis is made by the consistency between behaviors and symptoms of patients and those described in the diagnostic criteria.Although the diagnosis is operational to a certain extent in clinical practise, its assessment is subjective and lacks effective neurobio-logical indicators, resulting in a low consistency of diagnosis and great challenges in the early diagnosis and standardized intervention of youth mental illnesses.The prodromal symptoms in youth mental illness are unspecific and there is a decrement in neurocognition including social cognition by the emergence of traditional symptom sets.Therefore, transdiagnostic clinical staging model is of great significance in clinical assessment in youth mental illness.Here, the essentials of the " transdiagnostic clinical staging in youth mental health: a first international consensus statement" published in the World Psychiatry in 2020 were interpreted, with a detailed analysis of the key updates, aiming to provide a reference for clinical diagnosis and treatment of youth mental illness.