Background: Traditional "3+7" intense chemotherapy (IC) regimen is the standard treatment backbone for tness patients with newly diagnosed AML. The azacitidine plus venetoclax (AB) regimen has recently been recommended for elderly AML patients or those ineligible for IC treatment. However, neither the "3+7" IC nor "AB" regimen unmet the needs ofadequate safety and effectiveness, especially on aspects of early death and some subtypes of leukemia, such as M5, or with RUNX1, FLT3-ITD, TP53 mutation, or with MCL-1 up-expression. Chidamide, a novel oral histone deacetylase inhibitor, can overcome the upregulating of MCL-1 expression induced by venetoclax, and synergy with azacitidine and venetoclax induces apoptosis of acute myeloid leukemia cells. Azacitidine-Venetoclax -Chidamide (ABC) combination regimen had been successfully used for refractory relapsed AML and newly diagnosed AML-M5 by Prof. Bin Xu and Prof. Shengli Xue, respectively. Whether the ABC regimen can be comparable to the "3+7" IC regimen in newly diagnosed AML induction therapy is still unknown. Aim: This pilot study aims to evaluate the efcacy and safety of the ABC regimen versus the "3+7" IC regimen in newly diagnosed AML. Method: A total of 112 patients with newly diagnosed AML (not APL) were enrolled in this study. Thirty-one patients from the ABC Collaboration Group were untness or unwilling to undergo IC therapy and received ABC regimen treatment from May 2022 to July 2023. Eighty-one patients from GDPH in the AML Collaboration Group of South China were treated with a "3+7" (IC) regimen between November 2010 and August 2013. Treatment protocol: The ABC-28d protocol consists of azacitidine 75mg/M 2 , d1-7; venetoclax 100mg d1, 200mg d2, 400mg d3-28, and Chidamide 10mg, d1-6/week for 2 weeks, 28 days as one cycle.