In this study, we calculated the parameters E₂/E₀, (M₀-M₃)lgN₃, h value, K value, and b value of 51 earthquake sequences of M≥5.0 in the eastern part of Northwest China from 1970 to 2012. The results show that priority should be given to the E₂/E₀ and K value calculations in making the initial judgment of the earthquake type after the main earthquake. There is a good prediction result regarding the mainshock aftershock earthquake type and isolated earthquake sequence using E₂/E₀. Moreover,E₂/E₀ is unrestricted with respect to the aftershock number in the early stage. Historically, when the judgment result was based on E₂/E₀ to determine the mainshock-aftershock earthquake type and isolated earthquake sequence, it has generally been correct. The restrictions on the K value calculation are also relatively light. Through earthquake sample calculation, we found that the number of aftershocks within 2~3 days after most moderate-strong earthquakes could satisfy the K value calculation, and the discriminating power of the K value is relatively high. The parameter (M₀-M₃)lgN₃ has a high discriminatory power when judging the mainshock-aftershock earthquake type, but there are associated strict requirements and could be used as reference in practical work. The h value has a high discriminatory power when judging the multiple mainshock type and can provide a reference for earthquake trend judgment after the mainshock, but calculations by the h value require a sufficient sample number and the consistency and stability of the calculation results are weak. As such, it is suggested for use only as a reference in practical work.