Research on Growth Studies Seaweed (Eucheuma cottonii) with Various Different Planting Methods on Kalianda Strait, South Lampung" was done March until April 2010. The aim of this research ware to know and analyze the ratio of floating raft method, long line method, and off-bottom method to growth from Eucheuma cottonii covering as follows : growth rate; growth relative; and weight accretion. The data obtained were analyzed using parametric statistics with more than two different test groups (One Way ANOVA) and continued with LSD test on α = 5% level if data was significantly affected. The results of showed that the floating raft method is more effective than other farming methods. The highest growth rate of Eucheuma cottonii on the floating raft method amounted to 48.40% gr / day. As the same with highest growth relative was found in the floating raft method amounted to 1.569 g and weight accretion of highest on the method of long line of 122.39 gr.