Year of 2011, Phu Yen PPSD introduced a kind of parasitoid named Tetrastichus brontispae Ferriere (Hymenoptera: Eulophidae) to control coconut beetle. After rearing T. bontispae in the lab condition to determine its biological characteristics, the authors had conducted a study on viability, parasitic and spread of T. brontispae in the coconut plantation. T. brontispae had monthly released in the field from April 2012 to March 2013. After releasing 5 month, the authors had found T. brontispae from the coconut plantation in October 2012 lasting to March 2013. Number of mummiesltree were from 3.6 to 5.6 during the time from October 2012 to March 2013. These showed that T. brontispae have been able to survive on the coconut plantation in Phu Yen. Only 2 month after finding from the field, T. brontispae had spread to a distance of 500m in experimental condition.