Qitai Oasis in Xinjiang has a large tract of sodic alkali soil and was hence selected as a study zone to explore relationships of halophyte coverage with soil alkalization indices (pH, exchangeable sodium percentage (ESP), sodium adsorption ratio (SAR), residual sodium carbonate (RSC), total alkalinity (TA)). It was found that in the soil of the study zone, existed large volumes of exchangeable sodium, strongly alkalizing the soil. Halophyte coverage was negatively related to all the soil alkalization indices to an extremely significant extent, especially to soil pH, being the highest (0.810), which was followed by ESP. Soil alkalization was the major factor affecting halophyte coverage, which could, therefore, be used as a good indicator of the former. Based on halophyte coverage as the major index in combination with some soil alkalizaiton indices, such as pH and ESP, alkalized soil in the study zone was classified. Soils 50% or so in halophyte coverage, <8.0 in pH, <3% in ESP and <3 in SAR were classified as non-alkaline soil, those 10%～40% in halophyte coverage, 8.0～9.5 in pH, 3%～35% in ESP and 3～40 in SAR as alkaline soil, and those <10% in halophyte coverage, >9.5 in pH, >35% in ESP and >40 in SAR as Solonetz. Such classification not only broadens the look angle of the study on grading of alkalized soils, but also tallies with the local practical situation.