Abstract: A new era has been started by discovering DNA microarray technologies in fields of genetics. In this mini review article, the basic molecular methods and statistical analyses for DNA microarrays (DNA chips) technologies have been reviewed. Types of commonly used microarrays, the target labeling for detecting and quantifying of gene expression levels and approaches of DNA microarrays were described. Moreover, basic image and statistical analyses of microarray data such as cluster analysis and a general linear model (GLM) were also recited and summarized.