For the damaged pipes, it is difficult to reflect the damage status with the displacement modes and natural frequency obtained from the traditional finite element method or the experimental modal analysis method. In order to improve the effectiveness and reliability of diagnosis, the element strain mode difference is proposed as the identifying criterion of the pipes′ damage location. The strain mode is got using the large general finite software Ansys through the numerical simulation analysis of the damage of different degree in the same element and the same degree in different elements. Compare the value of strain modal in different conditions and strain modal in normal condition to analysis the result. The result shows that the way of difference of strain mode could have a good identification about pipeline damage location.