In order to determine the optimization condition of absorbing CO2 by microalgae and improve the absorbing rate,a reactor of microalgae to absorb CO2 was built.CO2 absorption influencing factors of pH value,light intensity,inlet concentration of CO2 and the concentration of microalgae solution were studied,and optimum operation conditions of CO2 absorption by microalgae were obtained(pH value around 9.0;light intensity of 1.5×104lux;inlet CO2 concentration of 10%;the initial microalgae solution concentration...