Forming process and composition of lunar soil were introduced in this paper, and the actual lunar soil physical and mechanical indexes were compared with and simulated CUG-1 lunar soil and normal dry sand, it was suggested that hard clods with certain cementing strength might be encountered in lunar coring drilling. To ensure the successful lunar coring drilling, a special polycrystalline diamond compact (PDC) coring bit should be developed. Based on the breaking rock mechanism of PDC bit, the negative rake angle, bypass angle, exposure height, gauge protection of PDC bit and brazing technologies of PDC cutters were designed respectively; and finite element analysis was made on the force of bit and drill stem assembly during drilling process. At last, the dry drilling test was made by special designed PDC bit, it indicated that the bit would be effective when rock drillability was less than or equal to Ⅵ, and it could stratify the requirements for lunar soil drilling.