Uniform design is a method choosing parts of cross-sectional experiment from parameter space. Comparing with actual comprehensive test method, this improved method can decrease the sample size and cut the cost of test. Uniform design was used for making the test plan of microwave effects of Low Noise Amplifier(LNA)，which contained two parameters and six values each. The sample size of uniform design was largely decreased by 75% compared to comprehensive test theoretically under the same condition. Simulation results indicate that, the combination of uniform design and succedent data processing can reach similar effect with comprehensive test, and the average comparative error of prediction is below 5%.