Abstract: The monomineral flotation test which for investigating the flotability of hemimorphite and the influence of n-octanol on the flotability of hemimorphite were conducted using dodecylamine (DDA) as collector. The results showed that the unactivated hemimorphite can be collected well by appropriate dosage of DDA while the pH of pulp located in 10 to 11. Hemimorphite can't be collected by n-octanol. Adsorption of DDA's cation on hemimorphite's surface and the minimum activated concentration of DDA were downgraded by n-octanol. The same flotation effect was achieved when using the combination collector which 25% amount of substance proportion DDA was replaced by n-octanol, compared with using DDA alone did.