The objective of this research was to verify that the use of reading text can improve the ability of the seventh grade students at SMP Negeri 6 Palu in using demonstrative pronouns. It applied a pre-experimental research design. The research sample was selected by using a cluster random sampling technique. The sample was 29 students of class VII U 3. The instrument of data collection was a test which was used twice as pre-test and post-test. The data gathered were analyzed statistically. The result of students' mean score in pre-test was 58.62 and the students' mean score in post-test was 95.31. By applying 0.05 level of significance and the degree of freedom (df) 28 (29-1=28), it showed that the t-counted value (23.51) was higher than t-table value (2.048). It means that the application of reading text can improve the ability of seventh grade students at SMP Negeri 6 Palu in using demonstrative pronouns.