Abstract: This research aims to determine the effect of seaweed type, seaweed seedweight, and its interaction to the growth and seaweed yield on the Bondre system culture and knows the seaweed type that can grow optimally on the cultivation through the Bondre system. This research also is desgined using Fully Randomized Design (RAL) Factorial with two factors: seaweed type and seaweed weight. Factor of seaweed type (J) consists of three borders: J1: type of seaweed Kappaphycus alvarezii, J2: type of seaweed Kappaphycus striatum, J3: type of seaweed Eucheuma spinosum. Seed weight factor (B) consists of borders: B1: seed weight 4 kg, B2: seed weight 6 kg, B3: seed weight 8 kg, B4: seed weight 10 kg. Each of the treatment border is so combined that it is gained 12 treatment interactions. Treatment is repeated such three times (3 long lines) that is obtained an experimental unit with 36 trial units.