Abstract: Mr. Ma Xin-fang, et al., published the paper Application of Fractal Method in Study ing Pore Structure in Reservoir Rock before andafter W aterflooding on periodical Xinjiang Petroleum Geology, No.3, 2003. The most important part or key point of this paper is the mathematicmodels and their deductions. However, these models and deductions are almost the same to those of prev iously published two literatures writtenby others. Is this real coincidence or questionable plagiary? Mr. Ma should make some explanations for them as necessary. It is believed thatearnest readers will make a proper judgement of this question.

Key words: rock, pore structure, fractal dimension, capillary pressure