English is known as international language for communication. If we talk about Pakistan, English is used as an official language however, the national language of Pakistan is Urdu. In schools, English language is taught as a compulsory subject. It plays a very important role in developing communication skills among students. The present research is related to analyze the effect of English subject teaching on the writing skills of Secondary School Students in South Punjab. In this research 9th class government and private school were taken as study sample. A writing skill test that was related to English language conducted for collecting the data. After collection of data a comparison chart was made. In this chart difference between both school students was clearly visible. Conclusion was made on the basis of result and in the end, suggestions were given for improving the writing skills of students.