The spectrum of XeF laser has been studied using two kinds of resonator mirrors. Two kinds of lasers on B-X and C-A transitions can be obtained under the same experimental condition. The formation time of the XeF(B-X) laser is 800 ns earlier than that of the XeF(C-A) laser. The influence of the original XeF2 concentration on XeF laser spectrum is studied in detail. The experimental results indicate that lower original XeF2 concentration impedes the formation of the XeF(B-X) laser. With the XeF2 concentration increasing,the XeF(B-X) laser presents the characteristic of a series of discrete line spectrum. The spectra of XeF(C-A) laser using two kinds of resonator mirrors are given. The XeF(C-A) laser spectrum is characterized by a continuous broadband spectrum and the absorption lines of atomic Xe can be observed in the spectrum. The narrow band XeF(C-A) laser can be obtained with the appropriate resonator mirrors. The bandwidth of the narrow band XeF(C-A) laser spectrum is 7 nm.