| Abstract： Objective Aiming at the low survival rate of marine medaka ( Oryzias melastigma) , the experiment was carried out to understand the feeding behavior development of marine medaka in early stage, which provided a theoretical basis for breeding. Methods The growth characteristic and feeding behavior of marine medaka had been observed and analyzed feeding with Artemia nauplii durying the first 90 days after hatching, by using a single camera, a waterproof-mirror and fish behavior analyze system. Results The results were as followed: its average growth rate in body length was 2.579%/d, and the relationship between body length and day-old age was y=3.132+0.383x-0.004x2+0.00003x3, R2=0.98. Its larvae period could be divided into 3 stages (larvae stage was 0~10 d, juvenile stage was 11~30 d and young stage was 30~65 d) and 6 phases (pre-larvae was 0~4 d, post-larvae was 5~10 d, pre-juvenile was 11~18 d, mid-juvenile was 18~24 d, post-juvenile was 24~30 d, and young was 31~65 d) according to several indicators of the different feeding behavior. At the 4th day after hatching (DAH), marine medaka were fed with Artemia nauplii that hatched within 12 hours. And all larvae can feed Artemia nauplii at 10th DAH. There was high mortality rate in larvae stage but the feeding ability was improved steadily. By the end of the period, the feeding success rate increased to 45%~55%, and the feeding efficiency reached 0.5-0.6ind/min. At the juvenile stage (26~30 d), all indicators of feeding behavior had been greatly improved, such as the response time to Artemia was shortened and the distance was elongated, the feeding rate increased, and food intake also increased. At the same time, the success rate of feeding had been raised to a high level, up to 90~95%. At the young stage, all indicators of feeding behavior were very close to the adult fish. The feeding efficiency reached more than 9 individuals/min. Its feeding behavior development was mature, and feeding function tends to prefect at this stage. Conclusion Experiments show that the marine medaka had a low feeding ability with a shot response distance to Artemia nauplii, and the feeding success rate and feeding efficiency still at a low level. The feeding success rate and feeding efficiency were gradually increased with its own development and feeding ability improving, and the survival rate tended stable. It may be an effective way to increase the survival rate of breeding when paying closed attention to the changes in feeding behavior of marine medaka through changing the feeding quantity and frequency that making more larvae fish transition to the juvenile period.