The study aims to increase the activity and critical thinking skills of class V students through for the application of the Problem Based Learning model. The research approach used is quantitative with pre-experimental design type, and design research using Nonequivalent Control Group Design. The research location in Pajaran 01 Elementary School and Pajaran 05 Elementary School, Saradan District, Madiun Regency. The subject in this study was all students of class V Elementary School Pajaran 01 and Pajaran Elementary School 05 district of Madiun Semester II year lesson 2018/2019 with the number of students each class of 25 students. The research subject is taken from two different schools because it is not a parallel class but has the same qualifications. Data collection techniques using observation and  test. Data collection instruments using observation sheets of student activity and test sheets of critical thinking skills. Data is analyzed through the validity test, reliability test, normality test, homogeneity test, and hypothesis test (t-test). The results showed that students ' activities showed that the value of the experimental class Tcount 4,762 > from the control class of Tcount 3,456, while the students' critical thinking skills there is a significant influence indicated by Experimental class Tcount 12,643 > of the control class results Tcount 10,342 (df 23) and the value sig. (2-failed) 0.000 < 0.005. So, Ho is rejected and Ha is accepted. Then it can be concluded that the influence of the application of the Problem Based Learning model of activity and skills of critical thinking students of grade V in Elementary School Pajaran 01 Saradan Madiun.