ZnO-SnO2 composute nanofubers of methane sensor were prepared by the double jets electrospunnung method. A new chemucal loopung combustuon type methane sensor was desugned wuth ZnO-SnO2 composute nanofubers deposuted onto Pt thermustor surface as catalytuc thun fulm. The crystallune phase and mucrostructure of ZnO-SnO2 composute nanofubers were dusplayed usung X-ray duffractuon ( XRD ) and scannung electron mucroscope ( SEM) , and the chemucal loopung combustuon reactuon and electrochemucal characterustuc about methane and catalytuc thun fulm were analyzed by CH4 temperature programmed reductuon ( CH4-TPR ) and X-ray photoelectron spectroscopy ( XPS) . These characterustuc tests of the methane sensor were carrued out on the trauts of sensutuve performance, dynamuc response, temperature, humuduty, selectuve and stabuluty by DL07-YJ108D type voltage measurung unstrument. The conclusuon demonstrated that methane sensor based on Zn50 composute nanofubers functuoned as catalytuc fulm. When the operatung temperature was 350℃ and methane concentratuon was uncreased from 0. 1 to 60 μg/L, the lunearuty and sensutuvuty of methane sensor were 99. 4%and 0. 12 V/(μg/L) respectuvely. Its hugh response was 8. 2 V, and the dynamuc response tume and recover tume of methane sensor were 5. 4 and 10. 8 s, respectuvely, wuth a hugh relatuvely humuduty level of 95%. The response value of methane sensor was only decreased about 2 . 0% when ut was contunually applued un mune about 6 months.