An　approach　for　estimating　the　leakage　power　and　the　speed　of　the　dual　threshold　domino　OR,　gates　based　on　Wavelet　Neural　Networks　(WNN)　in　45　mm　technology　is　proposed.　The　estimating　system　has　fast　convergence　and　high　precision.　By　studying　the　impact　of　the　dual　threshold　voltage　technique　(DTV)　on　leakage　reduction　and　delay　increase,　it　successfully　estimates　the　nonlinear　changing　of　the　leakage　power　and　delay　of　the　different　inputs　domino　OR　gates.　At　last,　the　reason　for　the　estimating　error　and　the　trend　of　the　estimating　curve　are　explained,　respectively.