The Boiler performance testing was conducted at Wujin thermal Power Plant, on May 13 - 22, 1992 to prove the boiler meet the guaranteed performance requirement. The tests were conducted according to the GB 10184-88, Performance Test Procedure for Power Boilers and the ASME PTC. 4. 1, Performance tests of Power Boilers Units. The items of test include boiler parameters, efficiency, Nox emission, characteristics of superheaters and reheaters, water circulation and performance under lower load without oil support. This paper provides a general introduction on the boiler equipment, operation record, and introduces the methods adopted in test and the results of performance tests. The results show that the quality and main performance indices of this boiler meet the designed requirement, have reached the advanced level in China and world level of the late 1980's.