Objective To investigate the effect of microwave ablation on pulmonary oligometastasis of liver transplant recipients without hepatic carcinoma. To observe the imaging changes after ablation. Methods A total number of 14 patients with 15 lesions were analyzed retrospectively. The ablation effect，complication and progression-free survival（PFS）were calculated. A total number of 15 lesions were divided into two groups，one group used the energy of 40 watt for 5 minutes，another group used the energy of 60 watt for 3 minutes . The short diameter and long diameter of ablation area were compared. The patient received follow up regularly. Results All the lesions were ablated by one procedure. The ablation area displayed“target sign”on CT image at first，then the lesion decreased in size during follow up，only fibrous scar can be observed at last. Different energy of 60 watt for 3 minutes and 40 watt for 5 minutes can get the same ablation effect. After ablation，the size of the short diameter and long diameter increased significant. The complication of pneumothorax was high（up to 71.4%）and 60% needed drainage. Incidence of bleeding of puncture tunnel and pain were 21.4%、28.6% respectively. Progression-free survival（PFS）was 7.4 months. Conclusion Microwave ablation can control pulmonary metastasis with acceptable complication. The ablation area displaied“target sign”on CT image.