Two lithium lines in the spectrum of the roAp-star HD24712 were analysed by the synthetic spectra method. Calculations for synthetic spectra were carried out for spectral regions from 610.2 to 610.4 nm and from 670.5 to 670.8 nm. The magnetic splitting of the lines and blending of lithium by rare earth elements were taken into account. Our analysis was performed with the use of the calculation program SynthM developed by S. A. Khan which takes into consideration the magnetic field influence on spectral absorption lines. The upper limit to lithium abundance is determined to be lgN/N_tot = -10.0.lithium lines,star atmosphere,roAp-star