The mineralogical characteristics of the rectorites-like occurred in coal parting of Shitouhezi Formation of upper Jurassic in Heilongjiang Province, were studied by XRD, IR and TGA-DSC analysis. The results indicated that the rectorites-like proportion in the partings of NO.18 Coal in the research area is ranged from 70% to 97%, and d(001) is between 2.659 nm and 2.696 nm, which is the multiples of other basal diffraction spacings, but the FWHM of all the basal diffraction spacings have large difference and d(060) was much wider, which is different from that of rectorites. The significant mineralogical difference between rectorite-like and rectorite and irregular smectie illite interlayer indicated that the former is the transitional mineral between the two laters. The lower temperature endothermal multi-peak of the rectorites-like between 50 ℃ and 200 ℃ indicated that the rectorite-like layers are rich in Ca. Fe-OH bending vibration absorption band at 870 cm-1, Si-O-Fe vibration absorption band at 474 cm-1 and the dehydroxylation endothermal peak of rectorite-like layers at 529 ℃ indicated that some octahedral Al and Mg are substituted by Fe. The rectorites-like in research area were resulted from diagenesis, the forming temperature of which was between 120 ℃ and 140 ℃.