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In order to improve the lubrication condition of high pair contact parts in point contact，the lubrication oil film in Hertz contact zone was studied. Coupled with contact mechanics and hydrodynamic lubrication equations，the multigrid method and Fortran language programming were used to solve the equations of EHL of isothermal point contact，and the curves of film thickness and pressure with different ellipticity Ke，load w，entrainment velocity u and viscosity ^0 were obtained. By studying the position of minimum film thickness and secondary pressure peak and the change degree of film thickness and pressure in the process of changing of film thickness and pressure， the factors affecting the change law of oil film in Hertz contact zone were obtained and analyzed. The results indicate that the contact ellipse changes with the change of ellipticity，load，entrainment velocity and viscosity，and the change of contact ellipse affects the film thickness and pressure of lubrication oil in varying degrees. In a certain range，increasing ellipticity，entrainment velocity and viscosity and reducing load are beneficial to improving lubrication performance. [ABSTRACT FROM AUTHOR]

Ｉｎ ｏｒｄｅｒ ｔｏ ｉｍｐｒｏｖｅ ｔｈｅ ｌｕｂｒｉｃａｔｉｏｎ ｃｏｎｄｉｔｉｏｎ ｏｆ ｈｉｇｈ ｐａｉｒ ｃｏｎｔａｃｔ ｐａｒｔｓ ｉｎ ｐｏｉｎｔ ｃｏｎｔａｃｔ, ｔｈｅ ｌｕｂｒｉｃａｔｉｏｎ ｏｉｌ ｆｉｌｍ ｉｎ Ｈｅｒｔｚ ｃｏｎｔａｃｔ ｚｏｎｅ ｗａｓ ｓｔｕｄｉｅｄ. Ｃｏｕｐｌｅｄ ｗｉｔｈ ｃｏｎｔａｃｔ ｍｅｃｈａｎｉｃｓ ａｎｄ ｈｙｄｒｏｄｙｎａｍｉｃ ｌｕｂｒｉｃａｔｉｏｎ ｅｑｕａｔｉｏｎｓ, ｔｈｅ ｍｕｌｔｉｇｒｉｄ ｍｅｔｈｏｄ ａｎｄ Ｆｏｒｔｒａｎ ｌａｎｇｕａｇｅ ｐｒｏｇｒａｍｍｉｎｇ ｗｅｒｅ ｕｓｅｄ ｔｏ ｓｏｌｖｅ ｔｈｅ ｅｑｕａｔｉｏｎｓ ｏｆ ＥＨＬ ｏｆ ｉｓｏｔｈｅｒｍａｌ ｐｏｉｎｔ ｃｏｎｔａｃｔ, ａｎｄ ｔｈｅ ｃｕｒｖｅｓ ｏｆ ｆｉｌｍ ｔｈｉｃｋｎｅｓｓ ａｎｄ ｐｒｅｓｓｕｒｅ ｗｉｔｈ ｄｉｆｆｅｒｅｎｔ ｅｌｌｉｐｔｉｃｉｔｙ Ｋｅ, ｌｏａｄ ｗ, ｅｎｔｒａｉｎｍｅｎｔ ｖｅｌｏｃｉｔｙ ｕ ａｎｄ ｖｉｓｃｏｓｉｔｙ η０ ｗｅｒｅ ｏｂｔａｉｎｅｄ. Ｂｙ ｓｔｕｄｙｉｎｇ ｔｈｅ ｐｏｓｉｔｉｏｎ ｏｆ ｍｉｎｉｍｕｍ ｆｉｌｍ ｔｈｉｃｋｎｅｓｓ ａｎｄ ｓｅｃｏｎｄａｒｙ ｐｒｅｓｓｕｒｅ ｐｅａｋ ａｎｄ ｔｈｅ ｃｈａｎｇｅ ｄｅｇｒｅｅ ｏｆ ｆｉｌｍ ｔｈｉｃｋｎｅｓｓ ａｎｄ ｐｒｅｓｓｕｒｅ ｉｎ ｔｈｅ ｐｒｏｃｅｓｓ ｏｆ ｃｈａｎｇｉｎｇ ｏｆ ｆｉｌｍ ｔｈｉｃｋｎｅｓｓ ａｎｄ ｐｒｅｓｓｕｒｅ, ｔｈｅ ｆａｃｔｏｒｓ ａｆｆｅｃｔｉｎｇ ｔｈｅ ｃｈａｎｇｅ ｌａｗ ｏｆ ｏｉｌ ｆｉｌｍ ｉｎ Ｈｅｒｔｚ ｃｏｎｔａｃｔ ｚｏｎｅ ｗｅｒｅ ｏｂｔａｉｎｅｄ ａｎｄ ａｎａｌｙｚｅｄ. Ｔｈｅ ｒｅｓｕｌｔｓ ｉｎｄｉｃａｔｅ ｔｈａｔ ｔｈｅ ｃｏｎｔａｃｔ ｅｌｌｉｐｓｅ ｃｈａｎｇｅｓ ｗｉｔｈ ｔｈｅ ｃｈａｎｇｅ ｏｆ ｅｌｌｉｐｔｉｃｉｔｙ, ｌｏａｄ, ｅｎｔｒａｉｎｍｅｎｔ ｖｅｌｏｃｉｔｙ ａｎｄ ｖｉｓｃｏｓｉｔｙ, ａｎｄ ｔｈｅ ｃｈａｎｇｅ ｏｆ ｃｏｎｔａｃｔ ｅｌｌｉｐｓｅ ａｆｆｅｃｔｓ ｔｈｅ ｆｉｌｍ ｔｈｉｃｋｎｅｓｓ ａｎｄ ｐｒｅｓｓｕｒｅ ｏｆ ｌｕｂｒｉｃａｔｉｏｎ ｏｉｌ ｉｎ ｖａｒｙｉｎｇ ｄｅｇｒｅｅｓ. Ｉｎ ａ ｃｅｒｔａｉｎ ｒａｎｇｅ, ｉｎｃｒｅａｓｉｎｇ ｅｌｌｉｐｔｉｃｉｔｙ,ｅｎｔｒａｉｎｍｅｎｔ ｖｅｌｏｃｉｔｙ ａｎｄ ｖｉｓｃｏｓｉｔｙ ａｎｄ ｒｅｄｕｃｉｎｇ ｌｏａｄ ａｒｅ ｂｅｎｅｆｉｃｉａｌ ｔｏ ｉｍｐｒｏｖｉｎｇ ｌｕｂｒｉｃａｔｉｏｎ ｐｅｒｆｏｒｍａｎｃｅ. [ABSTRACT FROM AUTHOR]