A　series　of　heterogemini　surfactants　C16H33OCH2CH(OH)CH2N+(CH3)(2)CnH2n+1　center　dot　Br　were　used　as　the　template　to　synthesise　porous　silica　materials　via　a　Stober　method.　The　influence　of　the　alkyl　chain　length　of　heterogemini　surfactants　on　the　morphology　of　porous　silica　materials　was　studied.　Porous　silica　materials　were　characterised　by　scanning　electron　microscopy,　transmission　electron　microscopy　and　nitrogen　adsorption-desorption　analysis.　Results　showed　that　with　the　increase　of　alkyl　chain　length,　the　morphologies　of　porous　silica　materials　gradually　transform　from　sphere　to　sphere　with　cavity,　sphere　composed　of　vesicles,　coral　like　and　finally　to　lamella.　Pore　size　of　materials　ranges　from　1.17　to　3.93　nm.　When　the　alkyl　chain　is　short　enough　(n　=　8　and　10),　a　hierarchical　pore　size　distribution　can　be　obtained.　The　possible　formation　mechanism　of　the　porous　silica　materials　has　been　discussed.