With a confocal Fabry-Pérot (CFP) cavity as a transfer cavity, the single-frequency laser can be stabilized to atomic or molecular lines when no atomic or molecular reference lines are available. In the experiment a CFP cavity as the transfer cavity is locked to homemade 852 nm grating-external-cavity diode laser whose frequency is stabilized to 6S1/2 Fg=4-6P3/2 Fe=5 transition of cesium atom via RF frequency-modulation spectrum and saturated absorption spectrum. The frequencies of external-cavity diode lasers at 908 nm and 830 nm are locked to the stabilized transfer cavity via Pound-Drever-Hall RF sideband technique, and thus stabilized with respect to the transition of cesium atom. Estimated from the locked error signals, the corresponding frequency jitters of diode lasers at 852 nm, 830 nm and 908 nm are less than ±540 kHz, ±340 kHz and ±60 kHz in 20 s, respectively; while the frequency fluctuation of the CFP cavity to the 852 nm laser is in ±550 kHz.