The complete process of preparing pitch-based carbon fibres from mesophase pitch has been extensively studied by numerous researchers. This process mainly includes mesophase pitch preparation, melt spinning, stabilization (pre-oxidation), carbonisation, and graphitisation. While each stage has been comprehensively and deeply investigated, the treatment methods and operations that determine the effectiveness of these steps have not yet received adequate attention or analysis. This paper introduces the acid treatment process between mesophase pitch preparation and melt spinning, as well as the post-treatment procedures following the production of graphitized fibres, aiming to provide technical guidance for researchers in related fields.