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The microwave pyrolysis system was used to study the effects of mixed additives on the microwave pyrolysis of Dunaliella salina. The mixed additive is a mixture of SiC and Na2CO3. The different weights of addition (5%, 10%, and 20%) of mixed additives, different mixing ratios (SiC:Na2CO3 = 0:10, 3:7, 5:5, and 6:4), and different kinds of additives (single additive and mixed additive) were studied. According to the findings, when the catalyst was 5% Na2CO3, the total weight loss (Mt) was maximum. The minimum Mt occurred at the 5% SiC group; when the mixed additive weight of addition was 10% and the mixing ratio of SiC:Na2CO3 = 5:5, the average weight loss rate (Rv) and weight loss rate for the first peak (Rp1) were maximum, and the time corresponding to the first peak (tp1) was minimum. Besides, SiC and Na2CO3 had a cooperative action when the mixed additive weight of addition was 10% and the mixing ratio of SiC:Na2CO3 = 5:5. For the total electricity consumption in microwave pyrolysis and oil and gas production per unit of electricity consumption, the mixed additive group with the weight of addition was 10% and the mixing ratio of SiC:Na2CO3 = 5:5 was better. [ABSTRACT FROM AUTHOR]