This study aimed to design a program based on visual thinking (VT) to develop the adult learners' English Language Fluency (ELF). The study started with literature review and previous studies related to VT, visual literacy, writing ability and writing fluency (WF). The researcher designed the research program, and the instruments of measuring the learners' progress including the WF components list, the pre / posttest, the rubric, and the participants' questionnaire. Participants were 14 adult learners (N= 14), with Arabic as their first language; enrolled at the upper intermediate level, Telecom Egypt Training Institute (TETI). They received a five-week intensive English language instruction, two sessions a week, to boost the learners' WF where the researcher was the instructor. The learners' scores on the pre / posttest were statistically analyzed using T-test and the effect size factor. In addition, a qualitative analysis of the learners' progress was conducted and analyzed. Both quantitative and qualitative analysis revealed the positive effect of using VT on developing the adult learners' English language fluency.