More and more studies have been done on the writing skills. However no clear study has been conducted on the best strategies used to improve to the ability of writing a fulfilled paragraph by the secondary stage students. Due to its importance, the present study is designated to present the main reasons for the students' weakness in writing a paragraph and the best strategies that can help them to overcome these obstacles. The researcher started his study with a background about the problem and its results. Then, he suggests some strategies for planning, revising and editing a paragraph. The methodology used in this research is the “Experimental Method". The experimental design used in this research is the Classical pretest-post test in which the total population of participants is randomly divided into two samples; the control sample, and the experimental sample. The subjects in this study are two groups students studying at Al-Diya secondary school plus ten of Arab English Language teachers who are going to fill a questionnaire about the strategies the researcher selected and used. The results of the two tests showed that the experimental group has got a higher score than the control group and this proves that the strategies used by the researcher were effective enough in improving the students' ability in writing a paragraph. The results of the questionnaire proved how much those teachers were aware of the importance of using such strategies to improve the students' writing ability. Finally, the results of the interview with the students showed the main reasons for their weakness in writing.