Paddy, wheat, corn and soy stored in large warehouse were sampled by electric bulk grain sampler. The impurity, broken grain or husked rice in peddy sample were texted. The inspection result sampled by electric sampler was compared with that by casing grain sampler and electric suction grain sampler. The result shows that there is no significant difference between electric bulk grain sampler and casing grain sampler. The difference between the average values is in line with national standards for repeatability requirement. Whereas, there is more impurities and unpolished rice in the samples acquired by electric suction grain sampler, compared with electric bulk grain samplers and casing grain sampler, the difference is significant. The differences between the average values exceed national standards for repeatability requirement, except for the wheat with fewer impurities. Therefore, it is suggested that the electric bulk grain sampler has overcome the limitations that casing grain sampler cannot reach sufficient depth of grain bulk and electric suction grain sampler could increase the amount of broken kernels or brown rice which is not suitable for impurity testing. It is able to meet the need of depth while sampling in the large warehouse, silo and squat silos. The test results of total impurities and broken kernels or brown rice can represent the original quality of the grain, which has a broad prospect of application.