Abstract: Objective To explore the prevalence of bad mood and related factors among some people with accident death or severe disability of the only child or apogeny related to family planning for effective health intervention in the population.Methods Totally 295 cases with family planning disadvantaged status were conveniently recruited from the registry list of Beijing Municipal Family Planning Commission,and a questionnaire survey was carrried out among the cases and 112 controls with the Bad Mood Qestionnaire.Results The score for anxiety,depression,loneliness,physiology unwell,and overall bad mood of the case group were 2.66±0.75,2.64±0.88,2.02±0.95,2.25±0.80,and 2.29±0.75,respectively,and were statistically higher than those of the control group(2.37±0.91,2.35±0.89,1.64±0.71,1.92±0.58,and 2.01±0.54).The scores of the infertility group for anxiety,depression,hostility,fear,adverse physiological,and overall bad mood were higher than those of cases with death or severe disability of the only-one child(P<0.05 for all).The scores for anxiety,depression,loneliness,poor physiological condition,and overall bad mood dimension of the subjects with poor economic status were 2.83±1.07,2.87±1.07,2.14±0.93,2.35±0.78,and 2.40±0.69 and those of the subjects with moderate economic status were 2.79±1.07,2.66±1.44,2.07±1.08,2.35±0.78,and 2.40±0.69,respectively,and all the scores of the two groups were higher than those of the subjects with better economic staus(2.31±0.92,2.33±0.97,1.80±0.86,2.02±0.78,and 2.06±0.71),with statistically significant differences(P<0.05 for all).But the score for fear in the moderate economic status group(2.39±1.14)was higher than that of the group with better economic status(1.99±0.97)(P<0.05).The female subjects had higher scores for depression(2.79±1.10)and hostility(2.12±1.04)than male subjects.The cases with low education level had higher scores in anxiety(2.73±2.64)and loneliness(2.08±0.95)than the cases with high education level,with statistically significant differences(P<0.05 for all).Conclusion The people with family planning difficulties tend to have more negative emotions than normal people.Negative pregnancy outcome,gender,economic conditions may affect the prevalence of bad emotion among the people with family planning-related difficulty.