Outlook on life is people’s overview and essential opinion on life. The contents of life are very rich while the phenomena of life are complex. Outlook on life primarily answers such fundamental questions as why people live and how people should live.There are always the positive and negative opinions or outlooks on life. This essay argues for the positive outlook on life and with regard to the theoretical and again extremely realistic question,it puts forward some preliminary understanding of positive outlook on life from three aspects of subjectivity basis, subjectivity manifestation and subjectivity demand, which are all based on the point of subjectivity.