The JGD single crystal furnace is a laser-based single crystal furnace featuring automatic diameter control for weighing. Unlike other single crystal furnaces that use power or temperature as control objectives, this furnace employs high-precision electronic scales as sensors and uses crystal weight as the control objective. The control software of the JGD single crystal furnace innovatively compares the theoretical weight of the crystal with the weight measured by the electronic scales to establish a closed-loop negative feedback system. By applying differential, integral, and PID theory, the software achieves intelligent control of the crystal growth process, automatically managing the growth of various high-quality crystals such as InSb, YAG, LYSO, TGG, and Ti: Al2O3 without human intervention. Additionally, the software collects growth process data using an SQLServer database for big data analysis and integrates remote monitoring functions, thereby improving production efficiency.