"在人文学方面" can be translated into English as "in the field of humanities" or "in the realm of humanities". Both expressions are commonly used to convey the idea of being within or related to the scope of humanities studies.
For example:
He has made significant contributions in the field of humanities.
（他在人文学方面做出了重要贡献。）
Her research focuses on issues in the realm of humanities.
（她的研究聚焦于人文学领域的问题。）