A study on the status of sickness and medical care of insured and non-insured groups of employee and his family in Naju fertilizer company, in the year of 1973, was carried out. The results obtained are as follows: 1. 66.8% of all employee was subscribed in this medical insurance program. No woman employee was subscribed and the rate of subscription was increased from 16.1% to 92.0% by age increases. 2. Also, as of period of service, the rate of subscription was increased from 11.3% to 89.4% by the period gets longer. 3. Employee who reside within boundary of the company (76.2%) subscribed more than that whom reside outside boundary (63.9%). 4. Rate of subscription was also indreased by family size becomes larger. In case of single, it was only 19.6% but in the case of family size became more than 6, it increased to 87.4%, 5. As of amount of monthly income, although no one had subscribed those who get less than 30,000 won a month. Subscriber, increased by monthly income get greater. 6. Subscribed family reside within company boundary utilized hospital 35.5 times a year whereas non-subscribed family reside within these utilized 12.5 times. And, subscribed family reside outside boundary utilized hospital 32.2 times a year and non-subscribed family utilized 9.6 times. Regardless of resident area, family who subscribed to this program utilized hospital more often than non-subscribed family. 7. The utilization of the hospital became gradually frequent from 15.6 times to 36.5 times per family by family size became larger. but in non-subscribed group, although it was increased from 8.3 times to 16.5 times per family, it was droped to the least 6.9 times at 2 person family. 8. 17,496 hospital visits were made by all employee and his family in the year 1973. 86.9% of them was made by subscribed group and the rest (13.1%) was made by non-subscribed group. Observing of the type of these sickness by the classification of WHO, only three types of VII (26.7%), XVII (25.0%) and IX(19.3%) were made more often by non-subscribed group while the others were made more by subscribed group. 9. Anual average medical expenditure per family was 13,098.9 won for subscribed family while it was 3,076.1 won for non-subscribed family. 10. Anual average hospital visits per capita was 6.5 times for subscribed groups and 3.4 times for non-subscribed group. Anual average medical expenditure per capita was 2,580.8 won for subscribed group while it was 1,061.0 won for non-subscribed one.