Microalgae has been mainly cultivated in open ponds or closed photobioreactors in which algal cells were grown in suspension and harvested through sedimentation, flocculation, filtration and/or centrifugation. The objective of the present research is to develop an attached algal growth system to facilitate biomass harvest with improved biomass yield. In the attached system, algal cells were grown on the surface of a material rotating between nutrient-rich liquid phase and carbon dioxide rich gaseous phase. Using Chlorella vulgaris as the model algal species, 16 materials were tested for suitability as attachment materials for algal growth. Cotton duct resulted in the best cell attachment in terms of durability, attachment and economy. The algal cells from the attached growth system were harvested by simply scraping off the algal biofilm.