The purpose of the study was to analyze the high frequency words used in the job advertisements. Now a day, people are interested in English language because there are more than 50 countries that use English to communicate and people use it to work. The researcher chose job advertisements to study the high frequency words because job advertisements can influence to people around the world. To study high frequency words used in the job advertisements, learner can apply frequency words to develop English skill and to use to apply for job. The information of the study used in the research was job advertisements. The researcher chose the purpose of the study was to analyze of English used in job advertisements. The samples of the study included texts in 250 job advertisements, five types were hotel, education, travel, airlines business and company. The instruments consisted of a corpus and a concordancing program, WConcord. The frequency word list was built and it showed that there were 76,576 word types in job advertisements Corpus. After words with less than 20 occurrences were deleted that there were 138 nouns, 32 verbs, 89 adjectives in the corpus and there were 9 common collocations found in the corpus. The result at the study show that the high frequency words which content words as common nouns are the most commonly used and followed by adjectives and verbs were equal frequency occurrences. The finding in this study indicates the high frequency words that used in job advertisements and they were collected from different genres. The result presented frequency words that could be involved in people’s life. There are several reasons to study about high frequency words. This study focused on the high frequency words used in job advertisements to increase vocabulary that commonly used and learner can apply to use their English knowledge on their own style.