This article explores and conceptualizes the individual mobilization processes into political party membership of a sample of young people in Hong Kong, a semi-autonomous and semi-democratic region under Chinese sovereignty where political parties are relatively underdeveloped. Based on life history interviews with 23 young party members, I found that the mobilization of young people into party membership comprises three different steps. I also found that not all young party members went through the same order of steps. In total, three orders of steps are identified, which create three different paths into party membership. Lastly, this article found that each mobilization path is shaped by a specific set of macro-, meso-, and individual level influences. Keywords: Party Membership, Young People, Life History, Hong Kong, Mobilization.