One of the global health goals is to improve maternal health and reduce child mortality. In order to reduce maternal and newborn diseases and deaths, it is necessary to focus on preconceptional health. Preconceptional care aims to prepare individuals for pregnancy, to maintain and result in a healthy pregnancy, and to ensure that future generations are composed of healthier individuals. It is important to provide the necessary education, care and counseling to women in the preconception period in achieving these goals. The World Health Organization states that initiatives taken after pregnancy occur are quite late in reducing the risks to the mother and newborn. For this reason, it is necessary to take the necessary steps during the preconceptional period in order to create the highest level of impact on health outcomes.

When evaluated in general, nowadays; preconceptional care services and the rate of benefiting from these services are low all over the world, including many developed countries. For this reason, an important part of women today she still continues to conceive with preventable risks. It is stated in the literature that the proportion of those who have heard about the concept of preconceptional care and counseling is low; knowledge and positive behaviors related to preconceptional care are insufficient. In the literature, it has been determined that especially young, illiterate women or women living in poor areas do not have adequate access to pre-pregnancy, pregnancy and birth services. From this point of view, it is necessary to ensure the awareness of society about the preconceptional period and to conduct studies on the subject. It is thought that if the individuals in the society are informed about this issue and awareness is raised, the rate of benefiting from preconceptional care and counseling services will increase.

Education is an important component of preconceptional counseling. Health education is a combination of learning experiences designed to increase individuals' knowledge, create positive attitudes and improve their health. The main purpose of education is to first create awareness (positive attitude) by providing information and to develop correct behavior or change wrong behavior. The Health Promotion Model, on the other hand, provides individuals to make behavioral changes to create a healthy lifestyle. This research has been planned in order to determine the effect of web-based pregnancy preparation education structured according to the health improvement model in the preconceptional period on women's knowledge, attitudes and health behaviors.

Material and Method: This study is a randomized controlled trial. The research is planned to be conducted with women who applied for marriage to the Marriage Officer of Erzurum Metropolitan Municipality Social Services Department between February 2023 and February 2025. The sample number of the study was calculated using the G\*Power 3.1.9.7 program. In the calculation, a sample calculation was performed for the t-test in independent groups (The Independent Samples T-Test) by taking into account the research design with 2 groups (Experimental Group, Control Group) and 2 measurements (pre-test - post-test). In the calculation made, the effect size was calculated as 0.80 (d = 0.80), 5% margin of error (α = 0.05) and 95% power (1-β = 0.95) and the number of samples for each group was calculated as 35. Considering the possibility of data loss, the number of samples in each group was increased by approximately 20% and determined as 42 people. In total, 84 women who applied for marriage were included in the sample.

In the collection of research data the introductory features form created by the researcher, "Preconceptional Knowledge and Attitudes Scale", "Preconception Health Behaviours Scale" will be used. In the evaluation of the data, SPSS package program will be used. Statistical significance level p\<0.05 will be accepted as.