Background/Purpose: To analyze and describe the patterns of cost of hospitalization and length of stay in people with intellectual disability.Methods: The 2007 National Health Insurance inpatient expenditures by admissions records of intellectual disability subjects were used to explore the usage of medical resources and influencing factors.Results: The average hospital admission was 1.6 times per year, subject older than 64 year-old had higher admissions record than other population. The average hospital expense per visit was 45328 NTD and length of stay was 13.1 days; average annual hospital expense and length of stay was 91048 NTD and 24.8 days. For claimants age older than 65 year old had longer length of stay, higher admission expenses than other groups. People suffering with moderate intellectual disability had shorter length of stay, fewer admission expenses than other groups. Subjects with major-illness and social warfare recipients had longer length of stay, higher admission expenses than full copayment groups. No gender difference in admission expenses.