Unconditional self-acceptance (USA) is a philosophy practiced to avoid the consequences of self-esteem in Rational Emotive Behavior Therapy (REBT). It is considered to be one of the determinants of psychological wellbeing. Despite its importance, it is one of the least studied constructs in psychological research. The literature on USA is focused on examining its relationship with various psychological symptoms and in relation to other psychotherapeutic approaches. However, there is little research evidence to understand the construct. To fill this gap, the present study aims to bring more clarity to the existing definition of USA by understanding its nature. The present study is a qualitative study and used an interview technique to collect data. For this purpose, ten mental health professionals were selected through purposive sampling. A semi-structured questionnaire was used for the interview. The interviews were audio-recorded and transcribed. Thematic analysis and coding techniques were used to analyze the data. Self-awareness, a positive view toward oneself and others, and social comparison were identified as important aspects of USA. Moreover, the current paper brought more clarity to the construct USA by proposing the nature of USA.

无条件自我接受（美国）是理性情绪行为疗法（REBT）中为了避免自尊后果而实践的一种哲学。它被认为是心理健康的决定因素之一。尽管它很重要，但它是心理学研究中研究最少的结构之一。有关美国的文献主要关注其与各种心理症状的关系以及与其他心理治疗方法的关系。然而，几乎没有研究证据来理解这一结构。为了填补这一空白，本研究旨在通过了解美国的性质来使美国的现有定义更加清晰。本研究是一项定性研究，并使用访谈技术来收集数据。为此，通过有目的地抽样选出了十名心理健康专业人员。访谈采用半结构化问卷。访谈均被录音并转录。使用主题分析和编码技术来分析数据。自我意识、对自己和他人的积极看法以及社会比较被认为是美国的重要方面。此外，本文通过提出美国的性质，使美国的构造更加清晰。