This study was undertaken to determine the concentrations of volatile organic compounds (VOCs) in the indoor air between houses of atopy, asthma patients and new houses. Total volatile organic compounds (TVOCs) in the indoor and outdoor air of normal houses were measured as 92.6 and 72.5 ㎍/㎥, respectively. TVOCs in the indoor and outdoor air of atopy patient\'s houses were 152 and 42.1 ㎍/㎥. TVOCs in the indoor and outdoor air of asthma patient\'s houses was 165 and 50.1 ㎍/㎥. TVOCs in the indoor and outdoor air of new houses was 158 and 78.3 ㎍/㎥. It was found that the concentrations of VOCs were higher in the indoor air of atopy, asthma patient\'s and new houses than the normal houses. This suggests that the concentration of VOCs can influence atopy and asthma. Keywords：Volatile organic compounds(VOCs), Indoor air, Atopy, Asthma, New houses