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Single W boson production is analyzed in a data sample collected by L3 detector at Large Electron Positron Collider in 1998. The integrated luminosity is 176.4pb-1 with center-of-mass energy at s = 189GeV. The signal consists of large missing energy final states with a single energetic lepton or two hadronic jets. The total cross section of single W production is measured to be 0.58±0.13±0.04 pb, in good agreement with standard model prediction. From this measurement, the limits on the anomalous γWW triple-gauge-boson couplings are derived at 95% confidence level: -0.48＜△kr＜0.38 and -0.50 ＜λγ＜0.41 .