7.2 Function The analysis of the information above has showed that the blood pressure measurement based on the parameter of pulse wave became the most advanced technology of non-invasive blood pressure measurement. It has proved the advantages of the parameter of pulse wave method to replace the traditional mercury sphygmomanometer trend, based on a variety of research and clinical validation. The retrieved documents from suitability evaluations and clinical application evaluation and the equivalent devices which have got CE certificate prove the accuracy of measuring blood pressure by the means of pulse wave, and consistently prove the complete performance of the pulse wave sphygmomanometer. Thus the literature has statistical significance, clinical importance and consistency of the results.