Differential scanning colorimetry(DSC) was used to screen out best excipientswhich do not interact with bendazac lysine(BZL).According to the preformulation studies,for-mulation composition and preparation of ordinary tablets have been designed. The humidificationof BZL was improved. The cumulative dissolution in 20min of the tablets was 98. 84%±0. 64%.Using thermogravimetry analysis(TGA ) method the activation energies of thermal degradationwere found to be 116±13(BZL) and 126±7(tablets)kJ/mol,respectively,which are not obviously different.On the other hand,the appearance and the content of the tablets had no change after three months of storage at 37℃ and 75% RH.