Tuyen Quang province might interplants between guava and Ham Yen king orange with the density of 600 plants/ha to prevent effectively Diaphoria citri Kuwayana, which mainly infects greening disease into Ham Yen king orange. The result indicated that, there were no more Diaphorina citri Kuwayana and greening disease occurrence in the interplanting orchard of guava and king orange in Ham Yen district. Moreover, 38,946,000 VND/ha was obtained as production income.