Three commonly-used evaluation methods for scramjet were summarized and analyzed

to improve the precision and objectivity for mixing evaluation

three new methods were imposed:the flow-field mixing efficiency

the flammable mixing efficiency and the flammable region percentage.The flow-field mixing efficiency can estimate the mixing performance of the flow structure and the effect of the mixing enhancement measurements.The flammable mixing efficiency and the flammable region percentage that took the flow-field blowout limits into consideration can connect with the ignition and combustion directly

objectively estimate the mixing efficiency for different lean and rich regions

and predict the region that combustion may occur.Then the three methods are verified and compared with the existed methods by two-dimension computational cases.