徐力教授认为肺结节内因为素体先天不足或后天失养，致肺气虚耗、脾气亏损、肝气不足或元气不充；外因为六淫、烟毒、雾霾乘虚而入，以致气郁、痰凝、血瘀、毒结，于肺络最虚处发为积聚。治疗上，徐教授以“三段”区分治法：攻毒散结期以攻伐为主，佐以扶正；扶正祛邪期虚实兼顾，攻补兼施；术后防复期调整偏颇体质，防止病情恶化及复发。在此基础上，结合“六辨”，辨肺积病位、病理类型、指标水平、病机特点、证候虚实、兼夹症状，灵活用药，达到辨病与辨证相结合。附验案1则。

Professor XU Li believes that the endopathic causes of pulmonary nodule is innate deficiency or loss of acquired nutrients resulting in depletion of lung qi,consumption of spleen qi,deficiency of liver qi,or insufficiency of original qi,and the external causes are six exogenous factors,smoke toxicity,and haze invading the body and leading to qi stagnation,phlegm coagulation,blood stasis,and toxin accumulation,then generating the mass in the most deficient areas of the lung collaterals. In terms of treatment,Professor XU distinguishes the treatment methods by “three stages”. In the stage of removing toxin and dissipating mass,the treatment is focused on attacking pathogenic factors,supplemented by strengthening healthy qi. In the stage of reinforcing healthy qi and eliminating pathogen,both deficiency and excess should be taken into account,and treatment with both tonification and elimination should be applied. In the postoperative stage for preventing relapse,the biased constitution should be regulated to prevent the deterioration and recurrence of the disease. Based on this,the “six differentiations”(differentiating disease locations,differentiating pathological types,differentiating level of indicators,differentiating characteristics of pathogenesis,differentiating deficiency or excess of syndromes,and differentiating concurrent symptoms) should be applied to guide the flexible medication and to achieve the combination of disease differentiation and syndrome differentiation. A proved case is listed.