Wearable　ECG　collection　system　for　home　detection　has　attracted　increasing　attention.　Such　devices　are　designed　to　be　portable　with　fewer　leads.　Reconstruction　from　three-lead　ECG　to　12-lead　ECG　can　provide　useful　auxiliary　information　for　telemedicine　dynamic　ECG　detection.　In　this　study,　two　reconstruction　algorithms　are　discussed,　and　the　correlation　coefficients　of　the　reconstruction　results　are　analyzed.　The　average　correlation　coefficient　in　the　randomized　experiment　reaches　0.901.　©　2021　IEEE.