[Objective] The objectives of the study were to analyze the overall spatial distribution characteristics of the ecological vulnerability of Dalian City and identify the sensitivity characteristics of the evaluation index system.[Methods] We constructed an urban ecological vulnerability index system based on sensitivity-recovery-pressure model (SRP), and the one-at-a-time method (OAT) was used to estimate the sensitivity of results under uncertainty of index weights.[Results] The vulnerability of Dalian City was classified into five levels:extreme vulnerability, high vulnerability, moderate vulnerability, light vulnerability and slight vulnerability, with an area proportion of 4.17%, 22.97%, 41.00%, 23.69%, and 8.16%, respectively. The areas with the highest vulnerability distributed in the city center and the east area of Ganjingzi District, while areas with the lowest vulnerability distributed in the northern part of Dalian and the junction of Ganjingzi District and Lushun District. The soil organic carbon showed the greatest impact on the evaluation results. The maximum absolute average change rate and the maximum pixel change rate was 11.49% and 17.27%, respectively.[Conclusion] The overall ecological vulnerability of Dalian City is at a moderate vulnerability level. The weight of soil organic carbon index should be carefully considered to reduce the uncertainty of evaluation results.