就无形资产评估中的商标评估的方法进行探讨，首先分析商标价值形成的机理，其次用扩散方程模式描述商标价值形成的特征，给出商标评估扩散模式方法，并且比较两种方法的特点，最后给出商标评估扩散模式方法使用的步骤。 This paper discusses the method of trademark evaluation in intangible assets evaluation. Firstly, it analyzes the mechanism of the formation of trademark value. Second, it uses the diffusion equation model to describe the characteristics of the formation of trademark value. It gives the method of brand assessment diffusion model, and compares the characteristics of the two methods. Finally, Give the steps used by the Trademark Assessment Diffusion Mode method.