We devote to an exploration of sub-gaussian random matrices (i.e. a random matrix with i.i.d mean-zero, unit variance, sub-gaussian entries) in a non-asymptotic setting, with the goal of obtaining explicit deviation inequalities. Therefore, we can use these deviation inequalities to show that sub-gaussian random matrix can be regarded as a random projection, which project from high-dimensional data to lowdimension space and preserve their relative distance.