The current study has two main objectives :to investigate the effectiveness of problem-based learning (PBL)approach  on EFL students' descriptive writing ability, and to explorefind out students' attitudes toward implementing  PBL approach in class while learning how to write a descriptive paragraph in English. Eighty students from Misr University for Science and Technology (MUST) paricipate in this study. The participant were devided into experemtal  (40 students) and control group (40 students). The research instruments included pre/post writing tests and a questionnaire. The data were analyzed. The findings show that there was a significant difference between the mean scores of posttest of the experimental group and that of the control group. In addition, regading the questionnaire results ,students show positive attitudes toward learning in PBL approach as it motivated them  and they became more passionate about the process of developing descriptive text writing skills.