Loving-kindness Meditation for Posttraumatic Stress Disorder

INTERVENTION: A 12‐week Loving‐kindness meditation program(weekly one hour group session, everyday homework) A 12‐week wait‐list control(receiving the same 12‐wwek LKM program after the waiting period) CONDITION: Posttraumatic Stress Disorder (PTSD) PRIMARY OUTCOME: The clinical severity of PTSD symptoms measured by the ADIS‐5 [ Time Frame: 0 ‐ 3 ‐ 6 ‐ 12 month ] SECONDARY OUTCOME: 1) The total score of the PCL‐5 [ Time Frame: 0 ‐ 3 ‐ 6 ‐ 12 month ]; 2) The distress ratings of PTSD intrusion symptoms measured by the ADIS‐5 [ Time Frame: 0 ‐ 3 ‐ 6 ‐ 12 month ]; 3) Improvements of PTSD symptoms measured by the Clinical Global Impressions Scale [ Time Frame: 0 ‐ 3 ‐ 6 ‐ 12 month ]; 4) Psychological indices: Self‐Compassion Scale, CLS, FFMQ, PANAS, BDI‐2, SWLS, DPES, SES, Social Connectedness Scale [ Time Frame: 0 ‐ 3 ‐ 6 ‐ 12 month ] INCLUSION CRITERIA: