This article compares the relationship between exports of goods and services of the Czech Republic and the development of economy of Germany, and between exports of goods and services of Slovakia and the development of economy of Germany. Germany is a major trading partner for the Czech Republic and also for Slovakia. Do Czech or Slovak exports influence the German GDP? This paper tries to find reasons for possible differences or similarities between the Czech Republic and Slovakia. The article uses the tools of time series econometrics, especially the ADF test, the Engle-Granger co-integration test, the error correction model, and the impulse-response analysis. Achieved results suggest that co-integration relationship between the Czech exports in goods and services and the German GDP exists. This relationship has not been confirmed for the Slovak exports in goods and services. The data used has the character of quarterly time series in the period from 2000Q1 to 2019Q1. EViews software version 9 has been used for the calculations.