In this contribution, we present a new chemodynamical model for the early evolution history of the Milky Way with an improved chemical evolution description. Our new approach is based on the chemical evolution model by Tsujimoto et al. (1999). This description enables us to construct a detailed chemical and dynamical model of halo stars in the Milky Way. Especially, we pay a special attention to a relation between chemical properties of halo stars and their kinematics.