A biological control slow release agent has: a slow release carrier and a slow release preparation wherein the slow release carrier absorbs the slow release preparation, and releases the the slow release preparation with a slow predetermined speed. The slow release carrier is able to slow release the slow release preparation in weeks, months or years, so that a small amount of the slow release preparation is able to achieve long term effect of insect attraction, to achieve the effect of reducing cost, insect attraction, and environmentally friendly.一種生物防治緩釋物,其包含有:一緩釋載體;以及一緩釋劑;其中,該緩釋載體係吸附該緩釋劑,並將該緩釋劑以一緩慢預定速率釋出該緩釋劑。該緩釋載體能夠以數周、數月或數年緩慢釋出所吸附之緩釋劑,故能以少量的緩釋劑而達到長效地誘引昆蟲的效果,所以能夠達到降低金錢消耗、誘引害蟲與對環境友善的效果。