Objective: To determine the effect of intervention on contraceptive efficacy. Method: The study is composed of three phases: (1) A baseline survey was conducted from Aug. to Dec., 1991. (2) An intervention program, which included strengthening education and introducing new contraceptive methods, was implemented from Jan. to Feb., 1992. (3 ) From Feb. to March, 1994, the second survey was carried out. Results: Main results are very successful. The rate of induced abortion decreased after intervention. The rate of contraceptive discontinuation after intervention was lower than that before intervention. Conclusion: The intervention program was very effective. Objective: To determine the effect of intervention on contraceptive efficacy. Method: The study is composed of three phases: (1) A baseline survey was conducted from Aug. to Dec., 1991. (2) An intervention program, which included strength education and introducing new contraceptive methods, was implemented from Jan. to Feb., 1992. (3) From Feb. to March, 1994, the second survey was carried out. Results: Main results are very successful. The rate of induced abortion decreased after The rate of contraceptive discontinuation after intervention was lower than that before an intervention. Conclusion: The intervention program was very effective.