Abstract: Taking a certain type 22^# pin jack electrical connector as the research object， the strain-life equation of the contact material was established based on the Brown-Miller correction criterion. The mechanical properties of a single insertion and extraction process of the contact part were calculated by finite element method and the contact fatigue life model of the contact part was established based on the Fe-Safe software. Then the quantitative evaluation of the influence of the mating error to the fatigue life of the electrical connector is completed. The results of fatigue life analysis show that the maximum displacement error is 0.038mm， the angle error is 0.621°， and the compound error is 0.03mm and 0.405°under the designed life condition. According to the results， detail fatigue life improving suggests for the electrical connector are proposed， the result provides a theoretical basis for the manufacturing and control of assembling errors and process improvement for the connector.

Key words: electrical connector, contact part, fatigue life, coordination error, contact performance