In order to reveal the effect of exogenous Ca²⁺ on the characteristics of the sprout tumble, we sprayed the plant cultivated for two years with bulbs by different concentrations of CaCl² solution (5, 10, 15, 20 and 25 mmol·L^-1), using the equal distilled water as the control, then measured the changes of the rate for sprout tumble and the physiological characteristics of underground part on sprout tumble stage. The results showed that: （1） the different concentrations of exogenous Ca²⁺ had effect on the plant sprout tumble characteristics， effectively extending the growth period of Fritillaria przewalskii to increas the bulb yield. The effect of the concentration of CaCl² on delaying the stage of sprout tumble was 15 mmol·L^-1>20 mmol·L^-1>25 mmol·L^-1>10 mmol·L^-1>5 mmol·L^-1> CK. （2）The different concentrations of CaCl² have significantly effected phenology of sprout tumble, and the greatest effect was found in the pretreatment sprayed by 15 mmol·L^-1 CaCl².Compared with the control, the phenology delayed 3~7 d at the fastigium of sprout tumble and 3～6 d to finish the fastigium of sprout tumble.（3）10~25 mmol·L^-1CaCl² can enhance the root TTC vigor and the activities of SOD,POD and CAT, and the bulbs have the highest levels of the root TTC vigor and activities of antioxidant enzymes by 15 mmol·L^-1 CaCl².（4）The results of comprehensive analysis of membership function show that, the resistance and viability of bulbs in F. przewalskii at sprout tumble stage by different concentrations of CaCl² from strong to weak are 15 mmol·L^-1>20 mmol·L^-1>25 mmol·L^-1>10 mmol·L^-1>5 mmol·L^-1> CK. All above suggest that 15 mmol·L^-1 CaCl² is the best treatment to delay phenology of sprout tumble,enhance the plant vitalities and the resistance, and increase bulbs yield.