Multifractal Spectrum Analysis of Crude Oil Futures Prices Volatility in NYMEX

International crude oil prices volatility has significant effects on global economic activities. On the basis of WTI crude oil futures price of New York Mercantile Exchange (NYMEX) from Apr 1983 to Aug 2008, this paper analyze the multifractal spectrum of crude oil futures prices. The results show that the crude oil prices have multifractal characteristics; international oil futures market has the property of scale invariance in the short-term. During the earlier periods, the oscillated magnitudes of futures prices were large and the characteristic of non-uniform distributions was apparent.