[目的]研究松墨天牛成虫林间种群数量序列的混沌特性。[方法]分别采用功率谱分析法、关联维数和嵌入维数、最大Lyapunov指数法。[结果]不同的混沌判定方法结果均显示松墨天牛林间种群数量序列具有混沌特征,属于混沌时间序列;当延迟时间τ=6、嵌入维数m=9时,对应的相空间中关联维数D=2.3415,最大Lyapunov指数λ1=0.4792。[结论]该研究结果可为松墨天牛的监测和预报工作提供参考。 [Objective] The research aimed to study the chaotic characteristics of the population series of Monochamus alternatus adults. [Methods] Power spectrum analysis, correlation dimension and embedding dimension, maximum Lyapunov exponent method were used respectively. [Result] The results of different methods of chaos determination showed that the quantity series of Monochamus alternatus forest had chaos characteristics, belonging to the chaotic time series. When the delay time τ = 6 and the embedding dimension m = 9, the correlation in the corresponding phase space Dimension D = 2.3415, the largest Lyapunov exponent λ1 = 0.4792. [Conclusion] The results of this study may provide reference for monitoring and forecasting Monochamus alternatus.