Attention to the energy extraction from the Biofuel has been increased due to the environmental pollution. Researchers have paid a lot of attention to microalgae as a renewable source for biofuel production. There are different technologies to produce microalgae biofuels including direct combustion, pyrolysis, gasification and anaerobic digestion. Identification of technology evaluation criteria to pick up the appropriate technology leads to lower costs, higher efficiency, less environmental pollution, and higher level of social welfare. This research is focused on the identification and ranking the technologies evaluation criteria and selecting the appropriate technology for producing microalgae biofuel using the DEMATEL and OPA methods. Initially, the criteria were identified based on expert opinions and previous studies and using the Delphi method in three stages. Then, using the DEMATEL method, the relationships, effects, and influences of the criteria were examined. Ultimately, the criteria weights were determined by the OPA method. The results indicated, profitability risk, environmental and social compatibility, employment creation, and increase in environmental pollution criteria were the most important ones. The technology gasification considered as the most important technology. This is because it provides more coverage for sustainability criteria. The use of this technology helps to reduce costs and pollution and increase welfare and service levels.