The temperature field characteristic of single-layer single-track cladding with synchronous powder feeding is analyzed by using the verified finite element model and the ANSYS software. According to the heating-pulse zone demarcation points and the peak points of the temperature curve on the upper surface of base at any moment, the section body for the warp deformation analysis is obtained by using two geometric planes to intercept the single-track cladding model. By analyzing the stress/strain states of the upper surface of the cladding layer and the upper and lower surfaces of the base, it is found that the reverse and forward bending occur successively on the section body. The cladding part exhibits deformation toward the laser beam macroscopically. Finally, the reasons for the warp deformation in the single-track cladding process are summarized.