This paper introduced a new index--geracomia effect index (GEI) which is expressed by the ratio of survival years of the elderly after their retirement to the expected survival years in order to evaluate the health care service to the elderly. The application of this index was discussed using the mortality data of cardiovascular diseases of a city from 1983 to 1994. The results showed that coronary heart disease, pulmonary heart disease and cerebrovascular disease had a stable influence on the survival years of the elderly during this period while the negative effect of diabetes had been weaken with the calendar years. However, myocardial infarction had begun to threaten the younger groups. The author realized that it needs further practice to make the index applicable.