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We analyse the restricted phase space thermodynamics (RPST) of Kerr-Sen-AdSblack holes with the central charge $C$ and its conjugate chemical potential$\mu$ but exclude the familiar $PdV$ term in the first law of black holethermodynamics. That gives rise to a new perspective on the thermodynamics ofblack holes. Using the scaling properties, we investigate the first law and thecorresponding Euler formula. Such formalism has its beauty, to say, forexample, the mass is considered to be a homogeneous function of the extensivevariables in the first order. In contrast, the intensive variables are ofzeroth order. Because of the complicated expressions of the metric, wenumerically calculate the critical values of the thermodynamic quantities. Wefind the phase transition behaviour of the free energy and other thermodynamicconjugate variables that appear in the first law. The RPST of the Kerr-Sen-AdSblack holes is like that of the Reissner-Nordstr$\ddot{o}$m-AdS and theKerr-AdS black holes. Such notions of the phase transition behaviour show thatthere should be some underlying universality in the RPST formalism.

Thermodynamics of Kerr-Sen-AdS black holes in the restricted phase space