Objective To explore the diagnostic value of magnetic resonance diffusion joint spectrum analysis technique in brain tumors. Methods From August 2013 to August 2014 in 40 cases confirmed by surgery and pathological examination for brain tumor patients as the research object, respectively, for patients with conventional magnetic resonance imaging, magnetic resonance (NMR) and diffuse check joint spectrum analysis, contrast analysis of two kinds of inspection mode of inspection results and apparent diffusion coefficient and the wave spectrum, and calculate the tumor enhancement region respectively and the contralateral normal area NAA/Cho, NAA/Cr and Cho/Cr ratio. And so on. Results The average ADC values for brain metastases (12.08+2.92)×10- 4 mm2 /s, the average ADC values for meningioma (13.17+2.98)×10-4mm2 /s, the average ADC values for astrocytoma was (13.76+2.99)×10-4mm2 /s. Three types of brain tumors of ADC values were higher than the contralateral normal brain tissue, the difference is statistically significant (P>0.05), and three kinds of tumor freely choose two kinds of comparison, there was no statistically significant difference (P>0.05). Three kinds of tumor of NAA was lower than those of normal group, the difference is statistically significant (all P<0.05), metastatic tumor with meningioma NAA/Cho, NAA/Cr value is significantly lower than that of astrocytoma (all P<0.05), three kinds of tumor Cr was lower than that of the normal brain tissue (both P<0.05). Astrocytoma with 4 cases of Lac peak, 1 case of Lip peak. Meningioma has 3 cases of Lac peak, 1 case of Lip peak, 1 case of Ala peak; In 2 cases of metastatic tumor Lac peak, 5 cases of Lip peak. Conclusion Magnetic resonance diffusion and spectrum analysis have their advantages and if the combined use of more sensitive and accurate to identify disease found disease, is worth to be widely used in clinical.