This study was performed to evaluate the engineering properties of cement mortar brick with loess and fly ash. The unit weight was in the range of $2,068{sim}2,137;kgf/m^{3}$ and $1,899{sim}2,045;kgf/m^{3}$ in water and dry curing, respectively It was decreased with increasing the loess content. The absorption ratio was in the range of $5.2{sim}13.1%$ and $8.5{sim}13.2%$ in water and dry curing, respectively. The compressive strength was decreased with increasing the loess content. The compressive strength of the 193 $kgf/m^{2}$ in water and 188 $kgf/m^{2}$ in dry curing at the curing age 28 days of the binder volume ratio 35% was exceeded in 163 $kgf/m^{2}$ of standard compressive strength about cement bricks. The carbonation depth was in the range of $0.9{sim}1.4$ mm, $1.2{sim}3.6$ mm, $1.4{sim}6.7$ mm and $2.4{sim}12.5$ mm in dry curing of curing age 14days, 28days, 90days and 360days, respectively.