The trial product of company SZ11-20000/35 successfully passed the test in National Transformer Quality Supervision and Inspection Center on the 11^th of July. The test items included routine test, temperature test, lightning impulse test, short-circuit capacity test and other test programmes. Compared with the original SZ9 products, this SZ11-based product can reduce no-load loss and load loss 20% and 5% respectively, reducing energy consumption greatly.