Abstract：The concepts of average radius increment and eccentricity increment are put forward and calculation formulas of angle parameter of initial contact point of continuous isometric polygonal profile connection are derived on the basis of researching geometry characteristics of isometric polygonal curve. Computational formulas of contact pressure of continuous isometric polygonal profile connection are established with Hertz touch theory. It may be seen that angle parameter is increased when average radius is decreased through analysis and example. Connection formed by qualified parts are fit together and can satisfy strength demand as long as contact pressure when average radius and eccentricity of hole are all maximum and average radius and eccentricity of shaft are all minimum.

Keyword：continuous isometric polygonal curve;isometric polygonal profile connection;initial contact point;contact pressure;