Abstract: In order to provide references for the selection of slim filter rod tow for slim cigarettes, slim tows of seven items were preselected, and a pressure drop model of the filter rods made of those selected tows was developed by multiple linear regression. The property curves were formed, and an empirical equation of filtration efficiency was established as a guide for slim tow item selection:1) Determining the ranges of circumference, length and filtration efficiency of filter according to cigarette design; preliminarily calculating the ranges of filament denier of tow and pressure drop of filter via the empirical equation of filtration efficiency. 2) Listing the tow items which satisfied the requirements; drawing the property curves of different tows via the filter rod pressure drop model; finally selecting suitable tow items by taking the property curves, filter rod weight and hardness into account comprehensively.