This research was conducted in order to know the effect of Logan Avenue Problem Solving (LAPS)-Heuristic learning model towards critical thinking skills of students of class X Office Administration (APK) in SMK Negeri 1 Ngawi, East Java, Indonesia on material curve and equilibrium of demand and supply, subject Introduction to Economics and Business. This research used a Quasi-Experimental Design. The population of the study was the students of class X-Expertise Business and Management SMK Negeri 1 Ngawi, East Java, Indonesia 2015/2016 academic year. Sample selection method used is Simple Random Sampling that obtained from grade X APK 2 which consists of 32 students as the experimental group learning using LAPS-Heuristic and X APK 1 which consists of 31 students as control group learning using conventional learning. The result showed there is a difference between the students in experimental and control group in term of their critical thinking skills.