Objective      To investigate the mental health characteristics and change regulation of the PLA armymen sent to Liberia against Ebola.       Methods      The armymen were divided into doctors

nurses and logistics staffs. The mental health dynamic change of 150 PLA armymen and the differences of the gender

age

category

military rank and education level in 5 mission stages (aggregation stage

training stage

mission early stage

mission late stage

and medical observation stage) were compared using the symptom checklist 90 (SCL-90) scale.       Results      The single-factor scores and the total average score of the obsession

social sensitivity

depression and anxiety factors varied significantly in the 5 mission stages (P0.05

P0.01)

and the scores were the highest in the aggregation stage (P0.05

P0.01). The single-factor scores (except for phobia and obsession factors) and the total average score of males were the highest in the aggregation stage (P0.05

P0.01). Females showed higher scores than males in somatization

obsession

depression

and anxiety factors in the first 4 stages (P0.05

P0.01). The single-factor scores and total average score of the obsession

depression and anxiety factors varied significantly between the group (31-40 years old) and the group (40 years old) (P0.05

P0.01). The group (40 years old) had higher scores in anxiety factor in the aggregation stage (P0.05

P0.01) and higher scores in depression factor in the training stage (P0.05

P0.01). The single-factor scores and the total score of the obsession

depression and anxiety factors varied significantly between the doctors and nurses (P0.05

P0.01)

and the nurses showed higher scores than the doctors and logistics staffs in the first 4 stages. Military officers had higher single-factor scores and total average score in some factors than the soldiers in the first 4 stages (P0.05

P0.01). The single-factor scores and the total average score of some factors in the armymen with bachelor degree were significantly higher than those in the ones with master degree and college degree in the first 4 stages (P0.05

P0.01).       Conclusion      The mental health conditions of the PLA sent to Liberia against Ebola varies according to the mission stages and the populations. When carrying out psychological work

we need to pay more attention to the aggregation stage

nurses

females and older armymen.