Bigeye thresher shark have been included in the CITES Appendix II list in this year, and ICCAT and IOTC have been included in the list of prohibited species, WCPFC may also carry on resource assessment and management of this species in the future. Therefore, to understand current resource of bigeye thresher shark, demographic and spawning per recruit (SPR) models were used for stock assessment of this species in the Pacific Ocean in this study. The results showed that Taiwanese tuna longline fishing vessels catch bigeye thresher shark mainly from December to April, annual production were 208 -405 metric tonnes from 2001 to 2016 with an average of 270 tonnes. Analysis average weight of bigeye thresher shark, the results showed a downward trend by years and fish size became smaller in trend. The results showed that population growth rates of this species were 0.81-0.95 year -1 . SPR analysis showed that the current spawning-potential ratio (SPR%) was much lower than the biological reference point SPR35%or SPR30%of common sharks, indicating that current fishing pressure of Pacific bigeye thresher shark has been overexploitation.