A reference current generator for a resistance type memory and a method thereof is disclosed. The reference current generator comprises N parallel circuit sets. Each of the N parallel circuit sets is formed with at least one first reference element and second reference elements connected in parallel. The number of the first reference elements plus the number of the second reference elements is N. The resistance value of first reference elements (a first resistance value) is not equal to the resistance value of the second reference elements (a second resistance value). An equivalent resistance provided with a equivalent resistance value between the first and second resistance value is formed by connecting the N parallel circuit sets in series between an input terminal and output terminal. A reference current is outputted from the output terminal by applying an operation voltage to the input terminal.