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Objective: A method for separating mRNAs by means of the polymerase chain reaction (differential display mRNA), and identifying the genes related to radiationinduced lung cancer was introduced. Methods: The RNAs were isolated from two pairs of samples, SV40-immortalized human fetal tracheal fibroblast cell (SHTF) versus αSHTF cell (transformed SHTF cell induced by α particles) and lung cancer tissue versus normal lung tissue obtained from one miner, and amplified by RTPCR. The differential expressed gene fragments were displayed by autoradiograph or silver nitrate stain. Results: The differential display mRNA method was established using both cell and tissue samples. The bands stained by silver nitrate were clearer than those on X-ray film. The rate of reamplification of differentially expressed gene fragments stained by silver nitrate is 80%, higher than that by autoradiograph, 50%.Conclusion: Differential display mRNA method was established successfully on both cell and tissue samples. The modified method for staining band increased the rate of reamplification and established the basis for confirming relative genes.