The current study aimed to develop some of  the speaking skills and motivation for the second preparatory stage students through utilizing  a co-operative based activities . The study adopted the quasi-experimental design. Participants were second-year preparatory school students. Two groups (20) each was randomly selected from El-Henawy preparatory school for girls and E-Nahal school for girls , Zagazig, El-Sharkia governorate in the academic year 2021-2022.The experimental group learnt through a co-operative based  activities for developing speaking skills and motivation. The instruments of the study included a checklist of speaking skills, an EFL Speaking test, and a motivation scale . Instruments were analysed using descriptive statistics and t-test. The scores of the experimental and the control group were compared and analysed. The results of the study indicated that the experimental group surpassed the control group in the post-motivation scale ,the experimental did better in the post-administration of the speaking test . Therefore, a co-operative based activities has been effective in developing EFL speaking skills and motivation of the experimental group students.