In this booklet, we discuss the fundamental principle of sati meditation. We also discuss how to focus on the meditation object, and how to overcome some of the obstacles that place on the way. It is not an easy work to achieve jhana with any concentration meditation. “this anapanasati” is difficult, difficult to develop, a field in which only the minds of The Buddha, The Pacceka Buddhas, and The Buddha’s sons are at home”. we discuss important and basic rules that meditators have to understand and apply. hopefully the reader will, after reading this discussion, be able to have a deeper understanding on anapanasati meditation and be able to apply the fundamental principle of ananpanasati up to the attainment of ‘right concentration’, jhana.