The cellulaseproducing strains have been isolated from Ningbo sea area by two ways. The first way is from the resource library of marine bacteria in our lab, and the second is from medium with CMCNa as the one and only carbon source. In the first way, 27 cullulaseproducing strains have been obtained from all the 365 marine bacteria by the CMC/Congo Red method. The proportion of cellulaseproducing strains is 7.40%. In the second way, 70 strains have been isolated and 68 strains can produce cellulase. The proportion of cellulaseproducing strains is 97.14%. The proportion of cellulaseproducing strains in the second way is much higher than that in the first way, but the enzyme activities are reverse. The proportion of cellulaseproducing strains with Hc greater than 2 is 25.93% in the first way and 0 in the second way.