The 51 traits were evaluated and 12 quantitative characteristics were classified with 39 alstroemeria varieties. The measure method of 6 quantitative traits of inflorescence were studied. The relationship between the length of outer middle tepal and outer lateral tepal was studied also. The results showed that “Inflorescence: length of peduncle” and “Inflorescence: length of pedicle” are not suitable for DUS testing, 43 characteristics were selected as DUS testing characteristics. 12 quantitative traits can be classified into 3~7 continuous grades respectively. The measure method had obvious effect on the quantitative characteristics of inflorescence, random observation was recommended in DUS testing. Some characteristics of the same variety were different between two batches. In most alstroemeria varieties, there are linear correlation between length of outer middle tepal and outer lateral tepal. Clustering analysis based on the morphological characters agreed with that "flower: the main color" could be used as grouping characteristic.