Abstract: It is possible to observe slow light based on transitions between Zeeman sub-levels of D1 line in rubidium atoms. In the experiment, when two laser beams with opposite circular polarizations (σ- and σ+), called probing and coupling light respectively, couple transitions between Zeeman sub-levels of D1 line F=2→F'=1 in rubidium atoms, electromagnetically induced transparency (EIT) with reduced?absorption and enhanced?dispersion is achieved in the atomic medium and simultaneously results in slow light. The reduction of the group velocity becomes more obvious with decreasing power of the coupling light and the ratio between the delay time to the pulse width is big for a pulse with a small width.