According to in-situ direct shear test and indoor direct shear test, the shear strength features of solidification gangues are researched. The experimental curve of shearing strength-shearing displacement shows that with the increase of the moisture content of the sample, the solidification gangue sample has shown obvious characteristics of viscoplastic body. Based on the on-site sieve grading of gangue samples, the moisture content and compactness of samples are adjusted to determine the influence of the changes on the shear strength of solidification gangue, and meanwhile the influence mechanism of the fine particle states changes on the shearing strength of solidification gangues is under research. The last, by the comparison of the shear strength test parameters of in-situ direct shear test and indoor direct shear test of gangue samples, the main causes of differences in shear strength parameters of consolidation gangue samples is analyzed.