Agenda ethnic assimilation in Indonesia often take a lot of attention, given the realities of multi-ethnic population. Assimilation pri and nonpri or between ethnic Chinese and the Natives have been made parties to create lasting social integration. One of them through the Islamization of the ethnic Chinese. Associated with it, PITI who organized ethnic-Chinese Muslims, have a lot of work in the middle of complex challenges. Various cases of ethnic violence in various cities, the May case `98, discrimination administration services, as well as the latent threat related to the socio-economic gap has proved the magnitude of the challenge for assimilation movement. Apparently, humans live in a world narrowed ethnicity and grim. This article photographing PITI organizational dynamics and participation in the assimilation movement, accompanied by an analysis of the drivers and internal and external constraints confronting. Laborious the ethnic assimilation agenda in Indonesia, the handling is one of the main pillars in strengthening national unity Keyword: Integrasi sosial, Muslim Tionghoa, Gerakan Pembauran