This research aims at analyzing mass balances of seven glaciers in Svalbard,Arctic,including Austre Brggerbreen,Austre Lovenbreen,Hansbreen,Irenbreen,Kongsvegen,Midtre Lovenbreen and Waldemarbreen, by using their long-time series of mass balance. Also,the effects of temperature and precipitation on the mass balance are discussed. Results show that: In recent 50 years,glacier mass balance in Svalbard has been mainly in negative balance and zero balance with slightly positive balance two states. Cumulative mass balance has showed a negative balance without fluctuation in a short term,except for Kongsvegen. Seasonally,there has been ablation in summer and accumulation in winter,with ablation in summer more than accumulation in winter. Between glacier mass balance and the equilibrium line altitude (ELA), there is a negatively correlation (mean R =-0.89); between glacier mass balance and the accumulation area ratio (AAR), there is a positively correlation (mean R = 0.84). Most glacier accumulation area ratio is going to decrease,showing glacier mass supply is in a disadvantage,resulting in a negative balance of glacier mass. Summer temperature increasing is probably a direct cause for accelerating glacier mass loss.