Abstract: Objective To investigate the effect of stereotactic body radiotherapy(SBRT) versus intensity- modulated radiotherapy(IMRT)in primary liver cancer(PLC) patients with secondary malignant tumor of vertebra.Methods A total of 49 PLC patients with secondary metastatic tumor of vertebra,who were treated in our hospital from December 2011 to January 2014,were enrolled and divided into group A(20 patients treated with SBRT) and group B(29 patients treated with IMRT).The prescribed dose was 35 Gy in 5 fractions in group A and35 Gy in 10 fractions in group B.The time to pain relief,imaging findings,and survival analysis were used to evaluate pain- relieving effect,the condition of lesions,and survival time.The t- test was used to compare continuous data between groups,and the chi- square test was used to compare categorical data between groups.The K- M method was used to plot survival curves for both groups,and the log-rank test was used for survival difference analysis.Results The proportion of patients who achieved complete or partial remission and stable disease shown by radiological examination after radiotherapy showed no significant difference between group A and group B(P = 0.873).The pain relief rate also showed no significant difference between group A and group B(P = 0.908).The time of pain relief showed a significant difference between group A and group B(t =- 3.353,P < 0.01).The overall survival showed no significant difference between the two groups(P = 0.346).Conclusion Radiotherapy has a definite therapeutic effect in PLC patients with secondary malignant tumor of vertebra.SBRT and IMRT have similar pain- relieving effects.However,with the same prescribed dose,SBRT has a short time to pain relief and does not lead to serious intolerable acute or late toxic and side effects in surrounding fast- response tissues.