A method of basis colorant selection based on gamut analysis and cluster analysis is proposed. Conventional 4-color gamut and target hifi-color gamut are analyzed to pick out the featured color sets where the colorants exist, and the principal component analysis is performed for the spectral reflectance of these colors to get the numbers of basis colorant m. With the cluster number m, spectral reflectance of the featured colors in the set is divided by clustering method, and the average spectral reflectance of the featured colors is calculated. m spectral reflectance among the m cluster which are most nearest to the average spectral reflectance is selected as the spectral reflectance of the basis colorant. The results show that the proposed method can estimate spectral reflectance of new basis colorant accurately, which realises the maximun reproduction of the target high fidelity color gamut.