Objectives: This study aims to identify the influencing factors of using postnatal care among illiteracy women who live in the Democratic Republic of Congo. Methods: Household survey was done from February 1 to 8, 2013 in the Kwango district of Democratic Republic of Congo, and 400 childbearing women who has under 5 years old children and pregnant women was randomly selected and answered through the interview with a questionnaire. For analysis the data, χ 2 test and logistic regression analysis were used. Results: Woman who can read, write and mathematical calculation was 195 (47.4%) of total 411 answers and 161 (39.2%) used postnatal care for their latest pregnancy. Age at first marriage (χ 2 =18.481, pqqqlt;.001), religions (χ 2 =11.165, p=.011), languages (χ 2 =35.586, pqqqlt;.001), the experience of children death (χ 2 =16.507, pqqqlt;.001), antenatal care over 4 times (χ 2 =15.315, pqqqlt;.001), postnatal care (χ 2 =15.558, pqqqlt;.001) is significantly different from literacy level. Among illiterate women group, who are protestant (OR=.330), using Lingala (OR=.128), took elementary education (OR=.223) and farmer (OR=.040), used less postnatal care. Conclusions: For increasing usage of postnatal care among illiterate women, new approach method should be considered such as a visual communication method and a community health workers’ training program for giving an outreach service to pregnant women care.