Although, English is a global language but in Tamil Nadu, English is learned as second language. People belongs to their own mother-tongue, but they go for other places communicate with English language. Since English is a dominant language in the present scenario, it becomes necessary to learn and mastery over such language. English used in the international communication, science, information technology, business, seafaring, aviation, entertainment etc. In schools English taught as a subject not as a language. English plays an important role in individual life as well as in the society. In schools’ English language is introduced from primary level but the students before going for school they used their mother-tongue. Naturally they used their mother-tongue for learning English. So, interfere of mother-tongue is the first barrier for the pronunciation problem. It is very difficult to learn a new language in the class limited hours. Sometimes the teachers used bilingual to teach English for ease of the students. This is the main problem. Some of the common pronunciation challenges occurred in learning English as second language. The aim of this research paper is the common factors affect the English pronunciation, accent and how to improve pronunciation to secondary school students in Nagapattinam, Tamil Nadu.