The term "Good Faith" is considered as a divisive term under discussion in modern English contract law. United Kingdom is an example of the most sterile jurisdiction for the growth of the term "Good Faith" although the origin of the doctrine was established in the English court. In Singapore the question of good faith has not arisen before, until the court appeal judgment in the case of Ng Giap Hon v west comb securities Pte Ltd and others. The court had the first chance of introducing the term " Good Faith" into the contract law in Singapore, but the court of appeal just failed to do so even in a soft approach way. Mainly with the mounting importance of transitional law the impact of the term "Good Faith" on English and Singaporean law is possibly to rise in the future. This research explore how mach important the term of "Good Faith" in English and Singaporean law.