Abstract: In order to find out the resource quantity and distribution of Coelomactra antiquata in Changle coastal waters, the investigation was carried out by using special fishing tackle in October 2012. Samples of C.antiquata were collected at only 4 investigation sites, accounting for 12.9% of the all 31 sites. During the investigation, only 9 samples were gathered, total weight was 376.5 g. The shell length of the samples was 27.11~113.55 mm, average of 61.29 mm; the body weight was 2.0~162.0 g, average of 41.8 g. The maximum value of distribution density and biomass of C.antiquata were 144.30 ind./hm² and 4.98 kg/hm² respectively. The results showed that the resource of C.antiquate in Changle coastal waters was declined obviously.