熔融沉积过程中，填充速度分别与分层厚度、喷头温度之间存在相互耦合作用，对制件的成型精度造成影响。文中分别对两种类型的聚乳酸 (Polylactic Acid，PLA) 试样进行了双变量实验，并以尺寸精度为评价指标，采用方差分析和多元非线性回归分析手段，研究填充速度与分层厚度、喷头温度之间的相互耦合作用机制，发现:填充速度与分层厚度、喷头温度的相互耦合作用对制件的尺寸精度影响显著; 制件的尺寸规格和形状影响了填充速度与分层厚度、喷头温度三元耦合控制函数的构建; 采用填充速度与分层厚度、喷头温度相互耦合的控制方式，可有效改善和稳定控制制件的尺寸偏差。

In the process of fused deposition modeling，the interactive coupling effects of filling velocity with layer thickness and nozzle temperature affects the forming accuracy of the parts． In this paper，a double-variate experi-ment on two types of PLA samples was conducted． Taking dimensional accuracy as the assessment index，ANOVA and multivariate nonlinear regression analysis were used to study the coupling mechanism among filling velocity，layer thickness and nozzle temperature．Results show that: (1) the interactive coupling effect of filling velocity with layer thickness and nozzle temperature has a significant impact on the dimensional accuracy of parts; (2) the di-mensional size and shape of parts could affect the coupling control function construction of filling velocity，layer thickness and nozzle temperature; and (3) by employing the coupling control method of filling velocity with layer thickness and nozzle temperature，dimensional deviation of FDM parts can be effectively improved and stabilized．