Mental health is a state of balance between the individual and the surrounding world also,it a state of harmony between himself with others coexistence between the realities of the self. other people and environment. The aim of this study was to identify the factors influencing mental health of school age children in Assiut Governorate. Results of this study revealed that the mean age of the studied children was (9.99 ± 0.35) years and they were 50.5% males and 49.5% females. There were a statistically significant differences between IQ levels and psychiatric disorder (P=0.000). There were a statistically significant difference between psychiatric disorders with malnutrition during pregnancy, exposed to stress during pregnancy, non follow up during pregnancy and receives medication during pregnancy (p=0.008, p=0.047, p=0.002 and p=0.048) respectively. This study concluded that the percentage of children who suffered from psychiatric disorders was higher in children who lives in rural area. Also, the percentage of children who suffered from psychiatric disorders was higher in those who had low socio-economic level. Recommended: That health education should gave to the parent through mass media to prevent child's mental disorder.