Abstract: Based on AGARD(AGARD-AR-304) and AIAA(AIAA S-071A-1995) of wind tunnel test uncertainty assessment, the standard is extended to the Φ0.5m hypersonic wind tunnel test. The specific procedure is:distinguish all the uncertainty sources according to the test process; estimate the uncertainty of independent variables, including the value of bias limit and precision limit; finally assess the uncertainty from dominance independent variables based on the standard, and assess the uncertainty from the attack angle using the linear interpolation. The result of a lifting model shows that the systematic errors are the major contributor to the uncertainty; the uncertainty results of C_N, C_A and C_m are notably different at different attack angles, while the relative uncertainty of C_m has the maximum value; the sensitivity analysis shows that the uncertainty from the balance and the total-pressure probe dominates the result.