以现代非线性动力学为基础，研究寸口桡动脉各部（寸、关、尺）自然（固有）脉象生成原理。根据人体血管分布非直线事实，提出弯曲脉管在血流脉动内压作用下的参数激振物理模型，导出计及脉管和外周软组织物理参数影响的控制脉管运动规律的变系数偏微分方程－脉象方程。 Based on the modern nonlinear dynamics, the principle of spontaneous (intrinsic) pulse generation in each part of the radial artery (inch, off, ruler) is studied. According to the fact that human blood vessels are non-linear, a parametric excitation physical model of curved vessels under the action of pulsating blood pressure is proposed. The variable coefficients partial differential equations governing the movement of vessels involved in the physical parameters of vessels and peripheral soft tissues are deduced. Pulse equation.