Several chemical corrosives which show the microstructure of Cr13 stainless steel are prepared. The paper introduces their methods and conditions of use and compares to their corrosive effects. The results indicate that corrosive which contains copper salt can make microstructures displaying clearly and have good reproducibility. In addition, it also has others advantages, for example, operation method and formula is simple and it can be preserved for long time. The paper provides convenient conditions for stainless steel optical microscope analysis.