The objective of the study is to compare some characteristics, decision-making returning to the providers due to side effects and the continuation rate between the Multiload Copper 250 IUD users in the campaign period and non-campaing period. The sample is randomly from 5,453 campaign period users and 6,326 non-campaign period users who were the new acceptors during October, 1985 and September, 1986 in Udornthani province. The data collection was done in November, 1988 by gathering data from client records and interviewing acceptors. A total of 256 campaign acceptors and 225 non-campaign acceptors were succussfully interviewed. The data analytical techniques used are percentage distribution, chi-square test and the life tables technique. The results reveal that age and desire for more children are not different between the two groups of acceptors but the number of living child and the use history of the acceptor are statistically different(p<.05). The decision to accept the contraceptive method is differ statistically (p<.05) in that the non-campaign acceptors chose the IUD by themselves but the campaign period accuptors did not. The husbandss support does not diffes. The continuation rate at the sixth month among the campaign period acceptors is statistically lower than that for the non-campaign acceptors but the rates are the same for later months. The campaign period IUD continuation rates at 6,12,18 and 24 months are 89.6, 86.3, 84.4 and 82.5 percent respectively while the non-campaign period contimuation rates are 95.8, 91.5, 87.8 and 85.6 percent respectively. When controlling for other variables such as age, number of living child, classification of acceptors and previous contractptive method, we find that the continuation rate in the age group 25-29 years at 6 and 12 months among the campaing period acceptors are statistically lower than for non-campaign acceptors. When the basis for the decision to select the IUD is controlled for the campaign period acceptors who had another contraceptive as their first choice have a lower continuation rate than the non-campaign acceptors perioc users who did the same. The campaign period acceptors who were advised to accept the IUD by the providers have lower continuation rates than the acceptors who chose the IUD independently. When controlling for source of service it is found that the compaign poriod acceptors who visited the community hospital have a lower contiunation rate at the sixth month than acceptors at local health centers. Finally, when returning for side effects is a control variable, it is revealed that the campaign period acceptors who returned to the providers because of bleeding and/or pain have statistically lower continuation rate than the normal period acceptors who returned because of these reasons at 6 and 12 months.