Acupoint specificity is a key scientific issue in acupuncture and moxibustion. Acupoint electric resistance is a commonly-used biophysical index to study the functional specificity of acupoints. The non-linear characteristics of acupoint electric resistance have great impacts on the measured values, but it has been greatly ignored. By analyzing the non-linear characteristics of acupoint resistance and its application in the study of acupoint function specificity, a new idea of introducing chaos theory and technology into the study of acupoint function is proposed.