In order to identify the factors of pregnant women malnourished in Kinshasa a study was conducted among 2,349 pregnant women. The results show that the malnourished pregnant woman in Kinshasa is illiterate (p <0.05), with food stress in her household (p <0.05), has at least one disease for which she is not supplemented with iron ([OR] 1.21), not using insecticide-treated mosquito nets [OR] 1.18), not dewormed (p <0.05), but sometimes receives preventive and intermittent malaria treatment (p <0.05) or health and nutrition education (p <0.05)".The pregnant woman malnutrition is amplified by the unfavorable cultural factors (lack of access to nutrition and health education, illiteracy), by the household's nutritional stress as well as by the non-use of ITN within Household. Malnutrition is even higher when the level of education of pregnant women is low (p = 0.01). The determinants model challenges more than one actor and the target itself. The responsibilities of decision-makers at central level are also challenged to organize an effective response. Pregnant women themselves should continually cooperate and adhere to strategies. The evidence generated remains necessary to help in the improvement, readjustment of interventions for pregnant women.