Sediment granularity, if well studied, can reflect regional natural environment and its change. This paper, based on a surface sampling 0~20 cm in a typical micro-physiography in northwest Shandong province, applies laser granularity analyzer to study the granularity with the results indicating that the regional surface sediment grains are similar with regional stream grains, which are chiefly siltstone. The spatial differentiation of sediment granularity is controlled by micro-physiography formed by alluvion and deposit swing and by paleoclimate, and by, as well, human’s irrigation from Yellow River.