Organic-inorganic　hybrid　silica　were　prepared　via　surfactant-mediated　assembly　of　1,2-bis　(triethoxysilyl)ethane　in　a　modified　stöber　process.　Factors　that　affect　the　size　of　silica　particles　were　investigated　in　detail.　It　is　found　that　larger　silica　spheres　are　obtained　under　lower　surfactant　concentration,　higher　ammonia　concentration　and　lower　synthesis　temperature;　The　size　and　dispersibility　of　silica　particles　also　depend　strongly　on　the　amount　of　water　in　the　mixture.　©　(2014)　Trans　Tech　Publications,　Switzerland.