This article focuses on the problem of scaling on the inner wall of the drill pipe during the diamond wire-line coring drilling process， which affects the smooth salvage of the core. Based on the research results at home and abroad， the main factors affecting the scaling on the inner wall of the drill pipe are systematically sorted out， and a calculation program that can conveniently and quickly calculate the scaling index I and critical diameter D_c is developed. It has been applied on site in scientific drilling projects， providing useful scientific guidance for on-site drilling engineers to prevent scaling and ensure safe and efficient drilling.