Abstract: The terrigenous clastic sedimentary rock is absolute majority in the coaly sedimentary series, its grain-size texture is mixed.with various degrees of matrixes. When the sediments transtorm from the transportation of high-energy environment into lower-energy environment, the carriers of higigh-energy make soil and sand deposit, so that the clastic sedments within grainsize of matrix ( 0.03mm≈5φ)-may easily mix up with coarser grain texrture, In this paper, the author uses the examples of the features of fluvial environment from Qinghai Muli coal field, to explain the close relations between the matrix mixed and medium energy and micro-facies environmet control. It is suggested that using thematrixes the nomenclature of the terrigenous clastic sedimentary rock, does not effect on classification but only on nomenclature, The rock with 10-20% matrix is named x x x rock of matrix, The rock with 25-50% matrix is uamed matrix quality x x x x rock. In the basic nomenclature of tarrigenous clastic sedimentary rock, the terms matrixand matrix qualityare used to describe the difference of the mixed amout-and the degrees of matrix, so that they may be easily applied in worke. In addition, the author proposes a preliminary view of the differences between matrixes and cements for the terrigenous clastic sedimentarg rockrefromed by virtue of temperature, pressure and structure,.