The structure, orientation and interactions of peptides in membrane bilayer is one important role of their biological activity. The antimicrobial and antibacterial peptides as bombolitin II and bovine lactoferrampin are amphipathic peptides which consist 17 amino acid residues with positively net charged. These peptides interact with lipid head groups of zwitterionic and negatively charged membrane lipid bilayers which are the important factor of the tilting behavior of the peptides in the membrane. The tilting behavior, dynamics structure and interactions of the membrane embedded peptides with lipid bilayers are included in this Series I. The cover picture shows the "High Tech Background Concept with Molecular Chain".