Purpose: This study was done to evaluate the validity of Korean Denver ll developmental screening test in screening children with developmental risk. Method: The participants in the study were 113 children referred for developmental assessment in the department of rehabilitation of D University hospital. They were examined with the BSID (Bayley Scales of Infant Development) II and Korean Denver II by one occupational therapist. The data was analyzed by $x^2$ test and discriminant analysis. Results: There was a significant relationship between the Mental Developmental Index (MDI) of the BSID II and the result of the Korean Denver II. The sensitivity and specificity of Korean Denver II were 0.87 and 0.62 when abnormal MDI was defined as lower than 85 was used as a diagnosis of developmental delay. There was a significant relationship between the Psychomotor Developmental Index (PDI) of the BSID ll and the result 0.7 Korean Denver ll. The sensitivity and specificity of Korean Denver II were 0.83 and 0.51 The over-all hit ratio was $79.6\%$. Conclusion: The result showed that the Korean Denver II was valid and has good sensitivity and moderate specificity in screening developmental delay.