The thermal performance of nano fluid containing Ag NPs with different stabilizers was studied in detail. The wall temperature distributions of the heat pipe containing pure water and a small amount of PAN/ Ag, PVP/ Ag, L-cys/ Ag, and OA/ Ag were determined, respectively. With the addition of a small amount of Ag NPs in the pure water, the heat pipe wall temperature became lower than that of pipes fi lled with pure water. The effi ciency under the same conditions was ranked as PVP/ Ag > L-cys/ Ag > PAN/ Ag > OA/ Ag. After adding a small amount of CNT in the mixture, the effect was enhanced further. As more CNT became dispersed in the working fl uid, the opposite effect was observed. Therefore, the optimal amount is 4 mg/L CNT in nano-fl uid. Ag nano fl uid could form the multi-scaled surface with higher wettability and spreadability. The wettability of nano-fl uid was improved with the addition of a small amount of CNT in the mixture. However, the spreadability of the mixture would decrease signifi cantly in the presence of more CNT. The thermal performance of nano fluid containing Ag NPs with different stabilizers was studied in detail. The wall temperature distributions of the heat pipe containing pure water and a small amount of PAN / Ag, PVP / Ag, L-cys / Ag, and OA / With the addition of a small amount of Ag NPs in the pure water, the heat pipe wall temperature became lower than that of pipes fi lled with pure water. The effi ciency under the same conditions was ranked as PVP / Ag> L-cys / Ag> PAN / Ag> OA / Ag. After adding a small amount of CNT in the mixture, the effect was enhanced further. Thus, the optimal amount is 4 mg / L CNT in nano-fl uid. Ag nano fl uid could form the multi-scaled surface with higher wettability and spreadability. The wettability of nano-fl uid was improved with the addition of a small amount of CNT in the mixture. However, the spreadability of the mixture would dec rease signifi cantly in the presence of more CNT.