The International Corpus of English (ICE), Nigeria corpus provides an immense source of useful data for research in Nigerian English studies. The paper describe the principle of corpus and explained how its data could be use to improve the learning process of English Language in Nigeria. Importance and role of some corpus analysis software were highlighted. Laurence Anthony’s AntConc version 3.5.2 was used to analyses the corpus data. Features such as Concordance, Concordance Plot, File View, Clusters (N-Grams), Collocates, Word List and Keyword List etc. were discussed. Open American National Corpus (OANC) was used to compare the ICE Nigeria in terms of Errors of English usage, Relative clauses of English. The ICE Nigeria corpus thus provides a useful data base for improving studies of the English Language.