Liquid loading affects gas well production. Theories for prediction of minimum flow rate for the continuous removal of liquids from gas wells include Turner model (coefficient is 6.5), Coleman model (coefficient is 5.5),Yang model (coefficient is bigger than 6.5), Li model (ellipsoidal) (coefficient is 2.5),Wang (ball cap) model (coefficient is 2.25) and etc. Various entrained droplet models have been developed to calculate minimum flow rate for keeping gas wells unloaded. The predicted minimum gas rate by these models differs greatly from each other. However, the former three models are used more than the latter two models in high production gas wells in Chuannan high permeability gas field. The latter two models are used more than the former three at low production gas wells in Daniudi, Sulige, Jinbian, Sebei, Chuanxi, which are low permeability gas fields. In the study, multiphase flow pattern and flowing pressure gradient distribution in tubing were analyzed to study the range of the minimum flow rate and compared it with the predicted values by these models. The effect of liquid loading on the gas permeability, gas production and gas production curve was analyzed to reveal the reason of low minimum flow rate in low permeability gas field. The study can help understand the regularity of liquid loading of gas well in low permeability reservoir, and is benefit for optimizing production and management for gas well in low permeability gas field.