The high qualityPorphyra haitanensis strain (Q-1) and the control were obtained from hybridization breeding and farmed, respectively. Growth, thickness, the four kinds of pigments, crude protein and amino acids of the thalli, and development of the conchocelis were studied. The results indicated that: (1) F2 and F3 thalli of (Q-1) grew fast and were not easily to become mature. The average daily length increase of F3 thalli that were 3 to 4 cm long reached 8.33±1.01 cm after being cultured for 10 to 15 days, which was 1.4 times higher than the male broodstock and 2.7 times higher than the female broodstock; (2) The thickness of F3 thalli was 21.0±1.5 μm and 25.6±1.9 μm at the first harvest and the second, respectively, which was 52% or 56% of the control. The daily length, width and weight increase of F2 thalli were 2.1, 2.4 and 2.2 times higher than the control after the first harvest; (3) The total phycobiliprotein of F2 thalli was 109.52±0.94 mg/g, which was 1.6 times higher than the control; and the crude protein reached 41.71±0.11 mg/g which was 27% higher than the control. The chlorophyll a of F3 thalli reached 7.66±0.19 mg/g at the first harvest which was 13% higher than the control; (4) The delicious and sweet amino acids of the flavor AA was 2.49 g/100g, which was 1.8 times higher than the control. The essential amino acids were 15.66 g/100g which was 13% higher than the control; (5) 90% conchocelis of (Q 1) or the control developed into sporangial branchlets cultured for 30 or 40 days at 29 ℃. The research may lay a foundation for the selection of high quality P.haitanensis strain with improved economic benefit.