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The investigation of Titanium dioxide (TiO2) nanoparticles on thermal characteristic of Tetraselmis chuii microalgae during combustion process has been carried out through a thermogravimetric (TG) analyzer. Tetrasemis chuii microalgae samples were cultured within 8 days at BBPBAP Jepara, Central Java, Indonesia. The microalgae sediment was dried at 80oC for 24 hours then was powdered by means of a mortar. Thereafter, the dried powder of microalgae was filtered with a size of 60 mesh. Titanium dioxide (TiO2) nanoparticles were used as catalysts with the particle size of 25 nm, these were obtained from Singapore Sigma Aldrich. Amount of 0.03 mg of TiO2 and 10 mg of Tetraselmis chuii microalgae were mixed mechanically using a mortar to guarantee the homogeneous blend, and then this sample was heated up in the oven for 14 hours at 80oC. The TG experiment was performed at a temperature range 25 to 900oC with atmospheric air at a flow rate of 50 mL/min and a heating rate of 15 oC/min. Differential method of Arrhenius is applied to evaluate kinetic parameters, including reaction order (n), activation energy (Ea), and pre-exponential factor (log A). The catalytic effect of TiO2 during the combustion process is compared with the pure of Tetraselmis chuii. The overall results of the investigation will be presented in the next full paper version