[Aim] The study analyzed the potential distribution of Chromaphis juglandicola and Panaphis juglandis worldwide, compared the impact of climate change on their distribution, and provided a basis for design integrated management strategies of walnut pests.[Method] CLIMEX software was used to simulate and evaluate the potential global distribution of C. juglandicola and P. juglandis under current and future climatic conditions, by analyzing laboratory and field experimental data.[Result] The results showed that the suitable areas were similar for both two walnut-feeding aphids. The main suitable distribution areas lie in Europe, North America and Asia for both species. The suitable area of C. juglandicola was larger than P. juglandis area around the world. However, in China, the suitable area of C. juglandicola is smaller than that of P. juglandis. The suitable area of two walnut aphids shift under the future climate change scenarios. The suitable areas in Europe, North America and Asia could expand eastward, while the suitable areas in China would gradually decrease.[Conclusion] The suitable areas of C. juglandicola and P. juglandis are mainly concentrated in parts of Asia, Europe, and North America within 25°N to 75°N. While in China, the suitable areas are mainly distributed in the eastern monsoon region.