Abstract: There were about 0.7 million traditional net cages in the bays of China. Their flat roofs were made in wood. PE tube was adopted for net cage flat roof in our research. Comparing with wood, it′s clear that PE tube was quick in fixing, convenient to unitary shift of the net cage, and equipped the solar energy electricity power supply system and life filth disposal establishment for net cage. The main parts of cultivation flat roof for PE tube net cage were made in standardized components, so it was simple and convenient to fix, and plasticity of the flat roof was high. Through the contrast of object test in Zhuhai for more than 1 year, the general performance of the whole set PE tube net cage was excelled traditional wood net cage. Cultivation flat roof for PE tube net cage offered references for reforming and replacing traditional net cage, and upgrading cultivation facilities.