We design a low-invasive microneedle array (MNs) to overcome the limitation from oral administration and injection (i.e. Digestive system degradation, and professional operation). The materials of MNs and mold are chosen with reference of USA Food and Drug Administration (FDA) and National Center for Biotechnology Information (NCBI), because the MNs will be used in-vivo. We manufacture the mold by traditional CAD machining. In order to verify the reliability of mold, we choose carboxymethyl cellulose (CMC) as main structure material of models. By a series of experiments, we examine MNs’ shape, physical characteristics and bio-compatibility.