We evaluated the ornamental value and bulb reproduction performance of the tulip cultivars exhibited at the Tulip Festival in Beijing. on the basis of ten characteristcs relevant to growth,flowering and reproduction. A comprehensive evaluation system of tulip cultivars was established by combining an AHP( analytic hierarchy process) and a grey correlation analysis. We first used the AHP to determine value of the weights of various factors scientifically. Then,the grey correlation analysis was carried out to...