Coherent population trapping ( CPT) atomic clock has irreplaceable advantages in miniaturization. The mid-long-term frequency stability of vapor cell-based CPT clock is limited by buffer gas collision and broadening. To overcome these limitations, the laser-cooling atom technique is an alternative method to improve the mid-long-term performance. However, the conventional cold atom system remains relatively complicate. A MOT based on planar elements is proposed, which consists of grating chip, coils chip, and a compact vacuum chamber. The 10 6 cold atoms are trapped with a single beam. Moreover, a laser stabilized on the Rb D2 line combined with time-multiplexed frequency shifting is proposed to realize laser cooling and CPT interrogation with a single laser. This work evaluates the potential for developing a miniature / compact high-performance cold atom CPT clock.