Five crystalline substances, which are positive to$L_{IEBERMAN}-B_{URCHARD}$ reaction, were isolated from the unsaponifiable fraction of the fresh leaves of Betula latifolia $K_{OMAROV}$ (Betulaceae)by silica gel column chromatographic purification. Compound $A;(C_{29}H_{50}O,;mp;136^{circ}), ;B;(C_{30}H_{52}O_3,;mp;165^{circ}), ;C;(C_{30}H_{52}O_4,;mp;237^{circ}), ;D;(C_{30}H_{52}O_3,;mp;196^{circ});and; E;(C_{30}H_{52}O_4,;mp;121^{circ})$ were isolated. Compound B was characterized as a new tetracyclic triterpenoid. Compounds A, C and D were identified as ${eta}-sitosterol$, betulatriterpene C, and betulafolienetriol, respectively.