This research aims to conduct a study that focuses on the effect of applying the Knisley mathematics learning model on students' mathematical connection abilities and self-confidence.This research is research using a quasi-experimental method with a research design in the form of a pretest-posttest control group design. The sampling technique used was cluster random sampling. The population in this study were all class XI students at SMAN 1 Tirtayasa, with a sample of 2 classes to be used as experimental classes, namely class The instruments used in this research were mathematical connection ability tests, self-confidence questionnaires, observation sheets and interviews. Based on data analysis, it was concluded that (1) Learning using the Knisley mathematics learning model had a positive effect on students' mathematical connection abilities, (2)Learning using the Knisley mathematics learning model has a positive effect on students' self-confidence.