The testing method and the results of air dy namic fieldtest are intr oduced fo r t he reform of the hig h pr essure oil boiler to burn oil and torch gas appended at the same time. Furthermor e, the author analyses existent pr oblems and puts forw ar d the advice to solve t hem. At present, China is carry ing out the project for transporting natural gases form west to east. The test results and analysis w ill be useful to the boiler reform project like the example mentioned abov e.