Compared with CHFR, which is widely used at present, Russian through casing resistivity logging technology has many advantages, such as not requiring well cleanout, great detection depth and higher practicability.  This paper analyzed the logging theory and technical characteristics of Russian through casing resistivity tool, and summed up the data application of nearly fifty wells which had successfully acquired materials. Fairly satisfactory application results were obtained in such aspects as the determination of the situation of the virgin formation oiliness, the monitoring of the dynamics of water injection, the checking of the movement of the edge and bottom water,  the search for the potential formation in the old wells, and the study of the potentiality and the distribution of remaining oil. These results provide reliable references for deploying new wells and regulating blocks. It is thus thought that Russian through casing resistivity logging technology can be widely applied to the remaining oil evaluation in old wells and blocks.