Abstract: While the fresh conidial powder of Collectotrichum gloeosporioides f. sp. veronicae was stored at 4℃ and room temperature in open or close capsule, germination rates and length of germ tube of conidia were examined at 15 and 60d intervals, respectively. Results showed that there were no significant differences in germination rates and length of germ tube of conidia stored at 4℃ and room temperature within 6 months. However, the germination rates and length of germ tube of conidia decreased significantly after storage for over 10 months at 4℃ or room temperature. In general, the conidia viability were most stable when the conidia powder with 4.0% water content was stored closely at 4℃ because the germination rates were 70.4% and the length of germ tube decreased only by 43.2% by the end of 420d comparing to that by 60d. Whereas, the conidia powder with 9.6% water content stored openly at room temperature were declined the most obviously, the corresponding values were 35.5% and 12.7% respectively. Therefore, storage temperature and water content of conidia were two key factors, influencing the shelf-life of C. gloeosporioides f.sp. veronicae conidia. The conidia were heat-treated in oven at 40-60℃ for 15-120 min to observe tolerance to high temperature of conidia. Results showed that the conidia powder was partly tolerant to temperature, while the susceptivity increased obviously with temperature rising. A regression analysis showed that the length of germ tube of conidia were decreased by 50% when heat-treated at 60℃ for 6 min comparing with that of control.