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Abstract-Classification of imbalanced dataset is the most popular and challenged problems for researchers to solve in nowadays. This paper proposed a two-steps approach to improve the quality of class prediction imbalanced breast cancer dataset. The two-steps approach consists of two main techniques: 1) using feature selection techniques to filter out unimportant features from the dataset; and 2) using the over-sampling technique to adjust the size of the minority class to be similar to the size of the majority class. The three different classification algorithms: artificial neural network (MLP), decision tree (C4.5) and Naï ve Bayes, were applied. The classification result indicated that C4.5 was the most suitable to classify this dataset which can give the highest accuracy of 83.80%.