Based on the direct quantum feedback method for controlling the quantum coherence of a qubit, the dynamical evolution of the quantum coherence of a qubit which interacts with a single mode cavity is investigated. By using the l1 norm of coherence and the relative entropy of coherence to quantify the quantum coherence, the effects of the quantum feedback and the external driving on the evolution of the quantum coherence are analyzed. The research results show that, the dynamical characteristics of these two types of coherences are the same. The quantum feedback slows the decay of the quantum coherence and plays a certain protective role. When the external driving is considered, the coherence of the steady state in the long limit becomes zero under the strong-driving condition, while the quantum coherence reaches a stable maximum value under the non-strong-driving condition.