To reduce the influence of thermal effect produced during the charge process of natural gas,which can be used as vehicular fuel,a mathematical model of natural gas storage system was established and solved by algorithm of SIMPLER with the charge time of 60 s and 180 s.The results revealed that charge amounts were 2.138 9 kg and 2.172 3 kg for the charge time of 60 s and 180 s,the charge performance loss approached 45.15% and 44.29% compared with isothermal charge,and the average temperature rise of the system were 74.76 ℃ and 72.72 ℃,respectively.It can be concluded that the charge performance is adversely affected by thermal effect,so some measures must be taken to alleviate it.