Objective: In frozen and thawed embryos, hardening can harm the zona pellucida (ZP). In this study, the ZP was thinned or drilled prior to frozen embryo transfer (FET). Methods: Patients were divided into two groups at random to receive LAH using either thinning or drilling after thawing. At a depth of 60-80% of the ZP thickness, 2-3 holes were made to thin the tissue using a laser. The inner membrane was left unharmed. The laser opening in LAD was created from the ZP’s outside to the interior.