Two kinds of tests are used to measure the friction angle of the coarse sand and polystyrene board.The test results show that with the increase of moisture content of coarse sand,there are not good regularity with the friction angle and cohesive when using comprehensive geotechnical synthetic materials determination. Meanwhile, the polystyrene board generates deformation. With the increase of percent moisture content of coarse sand, the friction angle has are good regularity when using non-granular mixtures friction angle determination. Meanwhile, the friction angle is basicly unchange.Therefore, the non-granular mixtures friction angle determination is superior to the comprehensive geotechnical synthetic materials determination.