Nan da nan bayan nasarar da ta samu, CPK ta ba da umarnin kaura daga dukkan garuruwa da garuruwa, inda ta tura daukacin jama'ar biranen zuwa karkara domin yin aikin noma, yayin da CPK ke kokarin sake fasalin al'umma zuwa wani tsari da Pol Pot ya dauka.Sabuwar gwamnati ta nemi sake fasalin al'ummar Cambodia gaba daya.Ragowar tsohuwar al'umma aka kawar da addini.An tattara aikin noma, kuma an watsar da sashin da ya rage na masana'antar ko kuma aka sanya shi ƙarƙashin ikon gwamnati.Kambodiya ba ta da kuɗin kuɗi ko tsarin banki.Dangantakar Demokradiyar Kampuchea da Vietnam da Tailandia ta kara tabarbarewa cikin sauri sakamakon rikicin kan iyaka da bambance-bambancen akida.Yayin da 'yan gurguzu, CPK ta kasance mai tsananin kishin ƙasa, kuma yawancin membobinta da suka zauna a Vietnam an wanke su.Demokradiyar Kampuchea ta kulla dangantaka ta kud da kut da Jamhuriyar Jama'ar Sin , kuma rikicin Cambodia da Vietnam ya zama wani bangare na fafatawa tsakanin Sin da Tarayyar Soviet, tare da Moscow ta goyi bayan Vietnam.Rikicin kan iyaka ya tsananta lokacin da sojojin Demokrat Kampuchea suka kai hari a kauyukan Vietnam.Gwamnatin ta yanke hulda da Hanoi a watan Disambar 1977, inda ta nuna rashin amincewa da yunkurin da Vietnam ta yi na samar da Tarayyar Indochina.A tsakiyar 1978, sojojin Vietnam sun mamaye Cambodia, suna tafiya kusan mil 30 (kilomita 48) kafin zuwan lokacin damina.Dalilan goyon bayan da kasar Sin ke baiwa kungiyar CPK shi ne hana wani yunkuri na Pan-Indochina, da kuma kiyaye martabar sojojin kasar Sin a yankin.Tarayyar Soviet ta goyi bayan Vietnam mai karfi don ci gaba da yin gaba na biyu a kan kasar Sin idan ana rikici da kuma hana ci gaba da fadada kasar Sin.Tun bayan mutuwar Stalin, dangantakar dake tsakanin kasar Sin mai mulkin Mao da Tarayyar Soviet ta kasance cikin kwanciyar hankali.A watan Fabrairu zuwa Maris 1979, Sin da Vietnam za su yi yaƙi da taƙaitaccen yakin Sino-Bietnam kan batun.A cikin CPK, jagorancin ilimi na Paris-Pol Pot, Ieng Sary, Nuon Chea, da Son Sen - sun kasance masu iko.Wani sabon kundin tsarin mulki a cikin Janairu 1976 ya kafa Democratic Kampuchea a matsayin Jamhuriyyar Kwaminisanci, kuma an zaɓi Majalisar Wakilan Jama'ar Kampuchea (PRA) mai wakilai 250 a watan Maris don zaɓar shugabancin gama-gari na fadar shugaban ƙasa, wanda shugabanta. ya zama shugaban kasa.Yarima Sihanouk ya yi murabus a matsayin shugaban kasa a ranar 2 ga Afrilu kuma an kama shi a gidan kama-karya.