  The aim of this paper is to determinate the fundamental parameters of six
exoplanet host (EH) stars and their planets. While techniques for detecting
exoplanets yield properties of the planet only as a function of the properties
of the host star, hence, we must accurately determine parameters of EH stars at
first. For this reason, we constructed a grid of stellar models including
diffusion and rotation-induced extra-mixing with given ranges of input
parameters (i.e. mass, metallicity, and initial rotation rate). In addition to
the commonly used observational constraints such as the effective temperature
T_{eff}, luminosity L and metallicity [Fe/H], we added two observational
constraints, the lithium abundance log N (Li) and the rotational period
P_{rot}. These two additional observed parameters can make further constrains
on the model due to their correlations with mass, age and other stellar
properties. Hence, our estimations of fundamental parameters for these EH stars
and their planets are with higher precision than previous works. Therefore, the
combination of rotational period and lithium help us to obtain more accurate
parameters for stars, leading to an improvement of the knowledge of the
physical state about the EH stars and their planets.
