The paper intends to demonstrate a Mosaic model in teaching intensive reading in TESOL class on the basis of constructivist theory of learning and teaching. Mosaic is an abbreviation for the following teaching procedure: making use of academic content, organizing information, scaffolding instruction, activating prior knowledge, interacting with others, cultivating critical thinking. The paper attempts to apply the Mosaic model to the intensive reading of Katherine Mansfield's A Dill Pickle at three levels: literal, critical and affective.