Objective To investigate the demographic and disease data of patients in psychiatricemergency who were not taking medicine. Methods Totals of 6 433 cases of non-medication patients whowere treated in department of emergency，Beijing Anding Hospital were included. According to the attack riskrating scale and the suicide risk factor rating scale，all patients were divided into attack group，suicide group，attack-suicide group and non-attack-non-suicide group. The demographic and disease data of each group were analyzed. Results According to the demographic data，ratio of female to male was 3 628 to 2 805. Most patients were living in Beijing， Han nationality， between 21-30 years old. Based on disease data， most patients were withno inducement， introverted and with no family history. There were significant differences in gender (χ2=18.513)，residence (χ2=9.46)，partner (χ2=17.40)，relationship between parents (χ2=27.21)，job (χ2=11.078)，in-ducement (χ2=8.402)，character (χ2=11.059) and family history (χ2=9.129) between attack group and non-attack-non-suicide group (P ＜0.01). There were significant differences in gender (χ2=15.894)，relationshipbetween parents (χ2=6.594)，inducement (χ2=67.309)，character (χ2=4.309)，family history (χ2=5.719) and physical disease (χ2=32.779) between suicide group and non-attack-non-suicide group (P ＜0.05). Patientsdiagnosed with manic state were easier to show aggressive behaviour，while patients diagnosed with anxiety and depression were easier to have suicidal behavior (P ＜0.01). Conclusions Most patients in psychiatric emer-gency department are women，aged 21-30 years old. Male patients who are living in Beijing，without partner，with bad relationship between parents，on duty，with inducement，extrovert，with family history of mental dis-eases and diagnosed with manic state are more likely to show aggressive behaviour. However female patients who are with bad relationship between parents，introvert，with inducement，with family history，with physical diseaseand diagnosed with anxiety and depression are more likely to have suicidal behavior.