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In order to go through the transition term from GDSII to OASIS successfully, the aid of the verification tools between OASIS and GDSII is necessary. In general, we have two methods of OASIS file verification. One is a hierarchical method that checks between GDSII and OASIS by each cell level. The other is a flat method that merges each pattern through its hierarchy into a flat level and compares the flattened geometry one by one. We did the experiments of comparison between two methods for OASIS to GDSII verification. The software too] called 'ogdiff has been used for a hierarchical verification experiment. We used SrnartMRC for the flat method experiment. In this paper, we show the experimental results of comparison and we also address the pros and cons of each method. Then we suggest which method is preferable for specific cases.