Abstract: It was an important aspect to study Rizhao green tea catechin quality index. Through to three times of sampling between Rizhao main tea growing in season spring, summer, autumn, using high performance liquid chromatography (HPLC) method for testing. The results showed that: average Rizhao green tea catechins content were 136.04 mg/g, spring tea were 127.96 mg/g, summer tea were 136.50 mg/g, autumn tea were 143.27 mg/g, autumn tea＞ summer tea＞ spring tea. Rizhao green tea catechin monomer content size average were EGCG＞EGC＞ECG＞EC＞C＞GC＞GCG, at the highest of EGCG, an average of 80.84 mg/g, accounts for 59.09% of the total catechin, followed by EGC and ECG, accounted for 14.90% of the total catechins and 13.83% respectively. Rizhao green tea catechin quality index of spring tea, summer tea and autumn tea were 652.14, 388.57, 522.13, annual average of 520.95, with spring tea best, next autumn tea, summer tea. Better reflected Rizhao green tea quality condition.