Nowadays, English Language is very important for communication with other people from different countries. This time English is official language and in the future English will be language for business in AEC , many country in AEC will be use English for communicate and work. Many people from ASEAN country will be come into Thailand for study, business and investment .So, English is very important for Thai people. For learning English language , learner must to have four skills, there are speaking ,writing ,listening and reading. In Thai student, studying English language is very difficult for them. The main problem of learning English language is vocabulary knowledge. According to (Tinutda & Waraporn , 2011), The biggest problem of learning any language is meaning of word , and vocabulary is biggest problem for majority learner.
In Thailand where English is used as a foreign language, the capacity in using English has become necessary for students as it is the international language for the spreading of technical knowledge and it helps convert the educational experience of limitless students( Rakchanok,2014 ).Thai students spend twelve years studying English in primary and secondary schools, but the results are problematic. When compared to people in near countries, Thais’ English knowledge is comparatively low. The 2010 Test of English as a Foreign Language (TOEFL) presented that Thailand ordered 116th out of 163countries (Thammasat University,2013). Thai students including Bangkok University students naturally like to learn word list by repetition for examination which will vanish from their memories very soon, so this vocabulary holding process is proved unusable and infertile. This problem can cause of poor score of English reading test because they will forget the learned words very soon since they can’t store and retrieve the words instantaneously . Additionally, there are some problems which make Thai students fail to study new words which effect in the incapacity to keep a large total of new words in their long-term memories . This is a problems of Thai students (Win,2012).
In learning of second language, vocabulary is an essential part of the four language skills. absent vocabulary, the skills of language learning including reading, writing, speaking and listening may not be successfully achieved . skillful of vocabulary is very important for learners. Vocabulary can help them when they communicate in the target language(Nathaya.2014). That is to say, it is important to get more understanding about how thai student use of vocabulary learning strategies and find the way to remembering English vocabulary for study English more easier.