Electromagnetically induced transparency (EIT) and electromagnetically induced absorption (EIA) are intriguing nonlinear phenomena of light-atom interaction. The study on their nonlinear behaviors has theoretical significance and potential applications. A closed-lambda four-level system consisting of hyperfine levels of excited state and those of ground state is proposed. In addition to a coupling field and a probing field, there are two radio-frequency fields which interact with hyperfine levels of excited state and those of ground state, respectively. In order to focus on detuning effect of the coupling field on the system, two resonant radio-frequency fields are used. By solving the equations of density matrix motion, both EIT and EIA are obtained in the system, and the frequency and feature of EIT or EIA are controlled by tuning the detuning of coupling field.