The main objective of this study is to design teaching model associating situated interesting and metacognition to enhance the performance of scientific learning of low achievement eighth grade student in scientific inquiry ability.In this study, quasi-experimental design was used and five eighth grade classes were selected respectively for the experimental group and the control group, which were respectively 153 students. Meanwhile, the score of physical science of the second semester of seventh grade was used as the grouping basis to divide the high, medium, and low achievement students of the experiment group and the control group. The teaching treatment period was the first semester of seventh grade for a total of three months. The experiment group received the teaching model designed by this study while the control group received traditional lecture instruction. Both groups of students were conducted with pre-test of scientific inquiry ability test before teaching, middle-test was conducted one and a half months after teaching, and post-test was conducted after teaching. There were 10 questions in the scientific inquiry ability test, including six recognizing scientific inquiry and four identifying controlled experiments, which Kuder-Richardson (KR) 20 reliability was 0.674 and re-test reliability was 0.628. In the data analysis, pre-test was used as covariate. Middle-and post-test performance was used respectively as dependent variable to conduct multi-variate analysis of covariance (ANCOVA). It was found from the research result that: 1. The scientific inquiry performance of low achievement student of the experiment group after teaching did not show any difference with student of middle and high achievement in the control group. However, it was still lower than the performance of middle and high achievement student in the experiment group; 2. After teaching, low achievement student of the experiment group did not show any difference in recognizing scientific inquiry to the high achievement student in the control group. However, in the identifying controlled experiment, it only showed no difference to the middle achievement student in the control group and such result explained that, relative to identifying controlled experiment, low achievement student in the experiment group showed better progress in recognizing scientific inquiry; and 3. From the above result, it was found that controlled experiment was an item that low achievement student showed slower progress and higher learning difficulty.