Due to the complexity and non-quantitative process of installation procedure of electric heater for propellant-line，test matrix method according to engineering experience was implemented to determine the influence of the status of insulation flim，glue thickness and embedded air bubble on pipeline heating. This study indicates that by choosing non-overlap wrapping for inner/outer insulation flim and 0.2 mm glue thickness using special rubber scraper， it is useful to reduce air bubble formation and improve the heating quality. The test results may serve as a reference for future installation of similar pipelines with electric heater.